2AN3WM5STAMP-C3M5STAMP

M5STAMP C3 2021 CONTENTS 1.OUTLINE ............................................................................................................................. 3 1.1. ESP32 C3 ..................................................................................................................................... 3 2.SPECIFICATIONS ............................................................................................................. 4 3.QUICK START .................................................................................................................... 5 3.1. ARDUINO IDE ............................................................................................................................ 5 3.2. BLUETOOTH SERIAL ....................................................................................................................... 5 3.3. WIFI SCANNING ............................................................................................................................ 7 1. OUTLINE C3 is the smallest ESP32 system board launched by M5Stack. It focuses on cost-effectiveness and simplification. It embeds an ESP32-C3 IoT control on a small and exquisite PCB board as small as a stamp (STAMP). Provide 13 IO expansion pins and a programmable RGB LED, combined with ESP32 internal interface resources (UART, I2C, SPI, etc.), can expand various peripheral sensors. It can be embedded in all kinds of IoT devices as the control core. 1.1. ESP32 C3 •A complete Wi-Fi subsystem that complies with IEEE 802.11b/g/n protocol and supports Station mode, SoftAP mode, SoftAP + Station mode, and promiscuous mode •A Bluetooth LE subsystem that supports features of Bluetooth 5 and Bluetooth mesh •State-of-the-art power and RF performance •32-bit RISC-V single-core processor with a four-stage pipeline that operates at up to 160 MHz •400 KB of SRAM (16 KB for cache) and 384 KB of ROM on the chip, and SPI, Dual SPI, Quad SPI, and QPI interfaces that allow connection to external flash •Reliable security features ensured by 1.Cryptographic hardware accelerators that support AES-128/256, Hash, RSA, HMAC, digital signature and secure boot 2.Random number generator 3.Permission control on accessing internal memory, external memory, and peripherals – External memory encryption and decryption •Rich set of peripheral interfaces and GPIOs, ideal for various scenarios and complex applications. 2.SPECIFICATIONS Resources Parameter Processor ESP32- C3 RISC-V single-core processor with a four-stage pipeline that operates at up to 160 MHz Flash 4MB Input voltage 5V @ 500mA button Programmable buttons x 1 Programmable RGB LED SK6812 x 1 Antenna PIFA Antenna IO x13 G4, G5, G6, G7, G8, G10, G1, G0, G21, G20, G9, G18, G19 Operating temperature 32°F to 104°F ( 0°C to 40°C ) 3. QUICK START 3.1. ARDUINO IDE Visit Arduino's official website(https://www.arduino.cc/en/Main/Software),Select the installation package for your own operating system to download. >1.Open up Arduino IDE, navigate to `File`->`Peferences`->`Settings` >2.Copy the following M5Stack Boards Manager url to `Additional Boards Manager URLs:` https://raw.githubusercontent.com/espressif/arduino-esp32/gh- pages/package_esp32_dev_index.json >3.Navigate to `Tools`->`Board:`->`Boards Manager...` >4.Search `ESP32` in the pop-up window, find it and click `Install` >5.select `Tools`->`Board:`->`ESP32-Arduino-ESP32 DEV Module >6Please install CP2104 driver before use: https://docs.m5stack.com/en/download 3.2. BLUETOOTH SERIAL Open the Arduino IDE and open the example program `File`->`Examples`->`BluetoothSerial`->`SerialToSerialBT`. Connect the device to the computer and select the corresponding port to burn. After completion, the device will automatically run Bluetooth, and the device name is `ESP32test`. At this time, use the Bluetooth serial port sending tool on the PC to realize the transparent transmission of Bluetooth serial data. #include "BluetoothSerial.h" #if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED) #error Bluetooth is not enabled! Please run `make menuconfig` to and en able it #endif BluetoothSerial SerialBT; void setup() { Serial.begin(115200); SerialBT.begin("ESP32test"); //Bluetooth device name Serial.println("The device started, now you can pair it with bluetoot h!"); } void loop() { if (Serial.available()) { SerialBT.write(Serial.read()); } if (SerialBT.available()) { Serial.write(SerialBT.read()); } delay(20); } 3.3. WIFI SCANNING Open the Arduino IDE and open the example program `File`->`Examples`->`WiFi`->`WiFiScan`. Connect the device to the computer and select the corresponding port to burn. After completion, the device will automatically run the WiFi scan, and the current WiFi scan result can be obtained through the serial port monitor that comes with the Arduino. #include "WiFi.h" void setup() { Serial.begin(115200); // Set WiFi to station mode and disconnect from an AP if it was pre viously connected WiFi.mode(WIFI_STA); WiFi.disconnect(); delay(100); Serial.println("Setup done"); } void loop() { Serial.println("scan start"); // WiFi.scanNetworks will return the number of networks found int n = WiFi.scanNetworks(); Serial.println("scan done"); if (n == 0) { Serial.println("no networks found"); } else { Serial.print(n); Serial.println(" networks found"); for (int i = 0; i < n; ++i) { // Print SSID and RSSI for each network found Serial.print(i + 1); Serial.print(": "); Serial.print(WiFi.SSID(i)); Serial.print(" ("); Serial.print(WiFi.RSSI(i)); Serial.print(")"); Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN)?" ":"*"); delay(10); } } Serial.println(""); // Wait a bit before scanning again delay(5000); } FCC Statement: Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmf…

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QA-FR-171-A Company: M5Stack Technology Co., Ltd Add: 106,1st Floor,Building 1,Bright Technology Park 88 Zhuguang North Road,XiliTaoyuan Street,Nanshan District,Shenzhen,Guangdong,China Tel: 13509230623 Fax: 0755-69815195 E-mail: [email protected] FCC Confidential Authorization Date: 2021-07-06 FEDERAL COMMUNICATIONS COMMISSIONS Authorization and Evaluation Division 74 35 Oakland Mills Road Columbia, MD 21046 Subject: Confidentiality Request regarding application for certification of FCC ID: 2AN3WM5STAMP-C3 In accordance with Sections 0.457 and 0.459 of the Commission’s Rules, M5Stack Technology Co., Ltd, hereby requests long-term confidential treatment of information accompanying this application as outlined below: Block Diagram Schemati cs Operation Description The above materials contain proprietary and confidential information not customarily released to the public. The public disclosure of these materials provides unjustified benefits to its competitors in the market. Sincerely, Signature: Printer Name: Jimmy Lai Title ： CEO

EXHIBIT A- EUT EXTERNAL PHOTOGRAPHS

Model: C3 FCC ID: 2AN3WM5STAMP-C3

EXHIBIT B - EUT INTERNAL PHOTOGRAPHS Antenna

Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RSHD210706001-00C FCC Part 15.247 Page 12 of 55 FCC §1.1310 & §2.1091 – MAXIMUM PERMISSIBLE EXPOSURE (MPE) Applicable Standard According to subpart §2.1091 and subpart §1.1310, systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091) (B) Limits for General Population/Uncontrolled Exposure Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm 2 ) Averaging Time (minutes) 0.3-1.34 614 1.63 *(100) 30 1.34-30 824/f 2.19/f *(180/f²) 30 30-300 27.5 0.073 0.2 30 300-1500 / / f/1500 30 1500-100,000 / / 1.0 30 f = frequency in MHz; * = Plane-wave equivalent power density; According to §1.1310 and §2.1091 RF exposure is calculated. Calculated Formulary: Predication of MPE limit at a given distance S = PG/4πR² = power density (in appropriate units, e.g. mW/cm 2 ); P = power input to the antenna (in appropriate units, e.g., mW); G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor, is normally numeric gain; R = distance to the center of radiation of the antenna (appropriate units, e.g., cm); Calculated Data: Mode Frequency Range (MHz) Antenna Gain Tune-up Output Power Evaluation Distance (cm) Power Density (mW/cm 2 ) MPE Limit (mW/cm 2 ) (dBi) (numeric) (dBm) (mW) BLE(1Mbps) 2402~2480 2.0 1.58 13.50 22.39 20 0.0071 1.0 BLE(2Mbps) 2.0 1.58 13.50 22.39 20 0.0071 1.0 Note: 1. The tune-up output power was declared by the manufacturer. 2. BT and Wi-Fi can’t support transmission simultaneously. Result: The device meets MPE at distance 20cm.

Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RSHD210706001-00B FCC Part 15.247 Page 13 of 66 FCC §1.1310 & §2.1091 –MAXIMUM PERMISSIBLE EXPOSURE (MPE) Applicable Standard According to subpart §2.1091 and subpart §1.1310, systems operating under the provisions of this section shall be operated in a manner that ensures that the public is not exposed to radio frequency energy level in excess of the Commission’s guidelines. Limits for Maximum Permissible Exposure (MPE) (§1.1310, §2.1091) (B) Limits for General Population/Uncontrolled Exposure Frequency Range (MHz) Electric Field Strength (V/m) Magnetic Field Strength (A/m) Power Density (mW/cm 2 ) Averaging Time (minutes) 0.3-1.34 614 1.63 *(100) 30 1.34-30 824/f 2.19/f *(180/f²) 30 30-300 27.5 0.073 0.2 30 300-1500 / / f/1500 30 1500-100,000 / / 1.0 30 f = frequency in MHz; * = Plane-wave equivalent power density; According to §1.1310 and §2.1091 RF exposure is calculated. Calculated Formulary: Predication of MPE limit at a given distance S = PG/4πR² = power density (in appropriate units, e.g. mW/cm 2 ); P = power input to the antenna (in appropriate units, e.g., mW); G = power gain of the antenna in the direction of interest relative to an isotropic radiator, the power gain factor, is normally numeric gain; R = distance to the center of radiation of the antenna (appropriate units, e.g., cm); Calculated Data: Mode Frequency Range (MHz) Antenna Gain Tune-up Output Power Evaluation Distance (cm) Power Density (mW/cm 2 ) MPE Limit (mW/cm 2 ) (dBi) (numeric) (dBm) (mW) 802.11b 2412~2462 2.00 1.58 16.00 39.81 20 0.0126 1.0 802.11g 2.00 1.58 21.50 141.25 20 0.0445 1.0 802.11n-HT20 2.00 1.58 19.00 79.43 20 0.0250 1.0 802.11n-HT40 2422~2452 2.00 1.58 21.50 141.25 20 0.0445 1.0 Note: 1. The tune-up output power was declared by the manufacturer. 2. BT and Wi-Fi can’t support transmission simultaneously. Conclusion: The device meets MPE at distance 20cm.

FCC PART 15.247 TEST REPORT For M5Stack Technology Co., Ltd 106,1st Floor, Building 1, Bright Technology Park, 88 Zhuguang North Road, XiliTaoyuan Street, Nanshan District, Shenzhen, Guangdong, China FCC ID: 2AN3WM5STAMP-C3 Report Type: Original Report Product Type: M5STAMP Project Engineer: Stone Zhang Report Number: RSHD210706001-00C Report Date: 2021-08-04 Reviewed By: Chris Wang Prepared By: Bay Area Compliance Laboratories Corp. (Kunshan) No.248 Chenghu Road, Kunshan, Jiangsu province, China Tel: +86-0512-86175000 Fax: +86-0512-88934268 www.baclcorp.com.cn Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RSHD210706001-00C FCC Part 15.247 Page 2 of 55 TABLE OF CONTENTS GENERAL INFORMATION ....................................................................................................................................... 4 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ..................................................................................... 4 OBJECTIVE ................................................................................................................................................................... 4 TEST METHODOLOGY .................................................................................................................................................. 4 MEASUREMENT UNCERTAINTY .................................................................................................................................... 5 TEST FACILITY ............................................................................................................................................................. 5 SYSTEM TEST CONFIGURATION .......................................................................................................................... 6 DESCRIPTION OF TEST CONFIGURATION ...................................................................................................................... 6 EQUIPMENT MODIFICATIONS ....................................................................................................................................... 6 EUT EXERCISE SOFTWARE .......................................................................................................................................... 6 SUPPORT EQUIPMENT LIST AND DETAILS .................................................................................................................... 8 EXTERNAL I/O CABLE .................................................................................................................................................. 8 BLOCK DIAGRAM OF TEST SETUP ................................................................................................................................ 8 SUMMARY OF TEST RESULTS ............................................................................................................................. 10 TEST EQUIPMENT LIST ......................................................................................................................................... 11 FCC §1.1310 & §2.1091 – MAXIMUM PERMISSIBLE EXPOSURE (MPE) ...................................................... 12 CALCULATED FORMULARY: ....................................................................................................................................... 12 FCC §15.203 - ANTENNA REQUIREMENT ........................................................................................................... 13 APPLICABLE STANDARD ............................................................................................................................................ 13 ANTENNA CONNECTOR CONSTRUCTION .................................................................................................................... 13 FCC §15.207 (a) – AC LINE CONDUCTED EMISSIONS ..................................................................................... 14 APPLICABLE STANDARD ............................................................................................................................................ 14 EUT SETUP ................................................................................................................................................................ 14 EMI TEST RECEIVER SETUP ....................................................................................................................................... 14 TEST PROCEDURE ...................................................................................................................................................... 15 CORRECTED FACTOR & OVER LIMIT CALCULATION .................................................................................................. 15 TEST RESULTS SUMMARY .......................................................................................................................................... 15 TEST DATA ................................................................................................................................................................ 15 FCC §15.209, §15.205 & §15.247(d) - SPURIOUS EMISSIONS ............................................................................. 20 APPLICABLE STANDARD ............................................................................................................................................ 20 EUT SETUP ................................................................................................................................................................ 20 EMI TEST RECEIVER SETUP ....................................................................................................................................... 21 TEST PROCEDURE ...................................................................................................................................................... 21 CORRECTED AMPLITUDE & MARGIN CALCULATION .....................................…

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FCC PART 15.247 TEST REPORT For M5Stack Technology Co., Ltd 106,1st Floor, Building 1, Bright Technology Park, 88 Zhuguang North Road, XiliTaoyuan Street, Nanshan District, Shenzhen, Guangdong, China FCC ID: 2AN3WM5STAMP-C3 Report Type: Original Report Product Type: M5STAMP Project Engineer: Stone Zhang Report Number: RSHD210706001-00B Report Date: 2021-08-04 Reviewed By: Chris Wang Prepared By: Bay Area Compliance Laboratories Corp. (Kunshan) No.248 Chenghu Road, Kunshan, Jiangsu province, China Tel: +86-0512-86175000 Fax: +86-0512-88934268 www.baclcorp.com.cn Bay Area Compliance Laboratories Corp. (Kunshan) Report No.: RSHD210706001-00B FCC Part 15.247 Page 2 of 66 TABLE OF CONTENTS GENERAL INFORMATION ....................................................................................................................................... 4 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ..................................................................................... 4 OBJECTIVE ................................................................................................................................................................... 4 TEST METHODOLOGY .................................................................................................................................................. 5 MEASUREMENT UNCERTAINTY .................................................................................................................................... 5 TEST FACILITY ............................................................................................................................................................. 5 SYSTEM TEST CONFIGURATION .......................................................................................................................... 6 DESCRIPTION OF TEST CONFIGURATION ...................................................................................................................... 6 EQUIPMENT MODIFICATIONS ....................................................................................................................................... 6 EUT EXERCISE SOFTWARE .......................................................................................................................................... 6 SUPPORT EQUIPMENT LIST AND DETAILS .................................................................................................................... 9 EXTERNAL I/O CABLE .................................................................................................................................................. 9 BLOCK DIAGRAM OF TEST SETUP ................................................................................................................................ 9 SUMMARY OF TEST RESULTS ............................................................................................................................. 11 TEST EQUIPMENT LIST ......................................................................................................................................... 12 FCC §1.1310 & §2.1091 –MAXIMUM PERMISSIBLE EXPOSURE (MPE) ....................................................... 13 CALCULATED FORMULARY: ....................................................................................................................................... 13 FCC §15.203 - ANTENNA REQUIREMENT ........................................................................................................... 14 APPLICABLE STANDARD ............................................................................................................................................ 14 ANTENNA CONNECTOR CONSTRUCTION .................................................................................................................... 14 FCC §15.207 (a) – AC LINE CONDUCTED EMISSIONS ..................................................................................... 15 APPLICABLE STANDARD ............................................................................................................................................ 15 EUT SETUP ................................................................................................................................................................ 15 EMI TEST RECEIVER SETUP ....................................................................................................................................... 15 TEST PROCEDURE ...................................................................................................................................................... 16 FACTOR & OVER LIMIT CALCULATION ...................................................................................................................... 16 TEST RESULTS SUMMARY .......................................................................................................................................... 16 TEST DATA ................................................................................................................................................................ 16 FCC §15.209, §15.205 & §15.247(d) - SPURIOUS EMISSIONS ............................................................................. 19 APPLICABLE STANDARD ............................................................................................................................................ 19 EUT SETUP ................................................................................................................................................................ 19 EMI TEST RECEIVER SETUP ....................................................................................................................................... 20 TEST PROCEDURE ...................................................................................................................................................... 20 CORRECTED AMPLITUDE & MARGIN CALCULATION ...........................…

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EXHIBIT C - TEST SETUP PHOTOGRAPHS Conducted Emissions -Front View Conducted Emissions -LeftView Radiated Emissions -Front View (Below 1GHz) Radiated Emissions - Rear View (Above 1GHz)