Grove modules are cool little add-on boards that connect through 4-pin header using UART, I2C, analog or digital I/Os, and usually you’d need to buy a HAT or shield to connect them to respectively Raspberry Pi or Arduino board. But Seeed Studio has come up with a small Arduino compatible board based on Microchip SAMD21 microcontroller called Seeeduino Lotus Cortex-M0+ that may be the cheapest “Grove” solution around as it sells for just $9.90.
Seeeduino Lotus Cortex-M0+ specifications:
- MCU – Microchip Atmel SAMD21 Arm Cortex-M0+ microcontroller at 48MHz with 256KB Flash and 32KB SRAM as found in Arduino Zero.
- USB – 1x micro USB port for power and programming
- 12x on-board Grove connectors (6x Digital, 3x Analog, 1x UART and 2x I2C)
- Arduino UNO headers
- 14x Digital I/O Pins (10 PWM outputs)
- 6x Analog Inputs
- I/O pins are 3.3V, do not input more than 3.3V, otherwise the CPU may be damaged
- Debugging / Programming – 6-pin ICSP header
- Misc – Reset button
- Power Supply
- Support Power Path Management
- Support 5V micro USB power or Li-Po battery
- 2A maximum charging current
- Suitable for low power design
- Dimensions – Arduino UNO form factor
The board is actually an update to Seeeduino Lotus v1.1 powered by ATMEga328 MCU and sold for the same price.I could not find any Wiki for the new board, but there’s plenty of documentation for Seeeduino Lotus, and the procedure should be about the same.