Design with Adafruit Feather M4 Express CAN in Cirkit DesignerThe Adafruit Feather M4 Express CAN is a versatile and powerful development board that harnesses the capabilities of the ATSAMD51 microcontroller. This board is part of the Feather ecosystem, known for its compact size, portability, and extensive I/O options. The inclusion of CAN-Bus connectivity makes it ideal for automotive applications, industrial automation, and any project where robust serial communication is required. The ARM Cortex-M4 core with a floating-point unit runs at 120 MHz, providing high computational performance for complex tasks.
This circuit integrates an Adafruit MPR121 capacitive touch sensor with an Adafruit Feather 32u4 Bluefruit microcontroller. The MPR121 is powered by the Feather and communicates via I2C (SCL and SDA) to detect touch inputs, which can be processed or transmitted wirelessly by the Feather.
Open Project in Cirkit Designer
This circuit integrates an Adafruit MPR121 capacitive touch sensor with an Adafruit Feather 32u4 Bluefruit microcontroller. The MPR121 is powered by the 3.3V supply from the Feather and communicates with the microcontroller via I2C, with SCL connected to pin 3 and SDA connected to pin 2 of the Feather. This setup allows the Feather to detect touch inputs from the MPR121 for further processing or wireless communication.
Open Project in Cirkit Designer
This circuit is designed for environmental data collection and logging, utilizing an Adafruit Feather M0 Express microcontroller as the central processing unit. It interfaces with a BME280 sensor for atmospheric temperature, humidity, and pressure measurements, an SGP30 sensor for monitoring air quality (eCO2 and TVOC), and a STEMMA soil sensor for detecting soil moisture and temperature. The system is powered by a solar panel and a 3.7v LiPo battery, managed by an Adafruit BQ24074 Solar-DC-USB Lipo Charger, and provides easy access to the microcontroller's connections through an Adafruit Terminal Breakout FeatherWing.
Open Project in Cirkit Designer
This circuit features an ESP32-S3 microcontroller interfaced with an SD card, two OLED displays, a GPS module, and a CAN bus module. It records GPS data to the SD card every second, displays speed in knots on one OLED display, and shows wind speed from the CAN bus in NMEA 2000 format on the other OLED display.
Open Project in Cirkit Designer| Pin Number | Function | Description |
|---|---|---|
| 1 | GND | Ground |
| 2 | 3V | 3.3V power supply output |
| 3 | AREF | Analog reference voltage for ADC |
| 4-9 | A0-A5 | Analog input pins |
| 10-15 | D5-D10 | Digital I/O pins, PWM capable |
| 16-17 | SCK, MISO, MOSI | SPI communication pins |
| 18-19 | SDA, SCL | I2C communication pins |
| 20 | RX | UART receive pin |
| 21 | TX | UART transmit pin |
| 22 | CAN_RX | CAN-Bus receive pin |
| 23 | CAN_TX | CAN-Bus transmit pin |
#include <SPI.h>
#include <mcp_can.h>
// Initialize MCP_CAN instance with SPI CS Pin 10
MCP_CAN CAN0(10);
void setup() {
Serial.begin(115200);
// Initialize CAN0 at 500 kbps
if (CAN0.begin(MCP_ANY, CAN_500KBPS, MCP_8MHZ) == CAN_OK) {
Serial.println("CAN Bus Module Initialized Successfully!");
} else {
Serial.println("CAN Bus Module Initialization Failed!");
}
}
void loop() {
// Check if data is available to read
if (CAN0.checkReceive() == CAN_MSGAVAIL) {
unsigned char len = 0;
unsigned char buf[8];
// Read data: len = data length, buf = data byte(s)
CAN0.readMsgBuf(&len, buf);
// Print received data
for (int i = 0; i < len; i++) {
Serial.print(buf[i], HEX);
Serial.print(" ");
}
Serial.println();
}
}
Note: This example demonstrates basic CAN-Bus communication using the MCP_CAN library. Ensure that the library is installed in your Arduino IDE before compiling the sketch. Adjust the CS pin number and CAN bus speed according to your specific setup.