M5Stack PICO User manual

M5STACK
PICO
2021

CONTENTS
1. OUTLINE ............................................................................................................................. 3
2. SPECIFICATIONS ............................................................................................................. 4
3. QUICK START.................................................................................................................... 5
3.1. ARDUINO IDE ............................................................................................................................ 5
3.2. BLUETOOTH SERIAL....................................................................................................................... 6
3.3. WIFI SCANNING ............................................................................................................................ 7

1.OUTLINE
STAMP-PICO is the smallest ESP32 system board launched by M5Stack. It focuses
on cost-effectiveness and simplification. It embeds an ESP32-PICO-D4 IoT control on a
small and exquisite PCB board as small as a stamp (STAMP). core. With the support of
ESP32, this development board integrates 2.4GHz Wi-Fi and Bluetooth dual-mode
solutions. Provide 12 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.

2. SPECIFICATIONS
Resources Parameter
Processor ESP32-
PICO-D4
240MHz dual core, 600 DMIPS, 520KB SRAM, Wi-Fi,
dual mode Bluetooth
Flash 4MB
Input voltage 5V @ 500mA
button Programmable buttons x 1
Programmable
RGB LED
SK6812 x 1
Antenna PIFA Antenna
IO x12
G0, G1, G3, G26, G36, G18, G19, G21, G22, G25,
G32, G33
Operating
temperature
32°F to 104°F ( 0°C to 40°C )

3.QUICK START
STAMP-PICO adopts the most streamlined circuit design, so it does not include a program
download circuit. When users use it, they can download the program through a USB-TTL burner.
The wiring method is shown in the figure below.
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://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/arduino/package_m5stack_index.json
>3.Navigate to `Tools`->`Board:`->`Boards Manager...`
>4.Search `M5Stack` in the pop-up window, find it and click `Install`
>5.select `Tools`->`Board:`->`M5Stack-M5StickC （ESP32-PICO-D4 used the same as STAMP-
PICO）`

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 harmful interference, and
(2) This device must accept any interference received, including interference that
may cause undesired operation.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment .This equipment should be installed and operated with
minimum distance 20cm between the radiator& your body.
Note: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However,there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
—Consult the dealer or an experienced radio/TV technician for help.