Picoino Cell R3 Atmega328p-au Microcontroller Board, 3V, 8mhz Arduino Compatible with Coin Battery Holder and Nrf24l01+ Wireless Transceiver (Or with Small Modification Esp8266 Wifi) Module Socket

Low current consumption battery board with NRF2401+ socket. 100% Arduino IDE compatible. 3V with on board coin battery or 3-5V with external power source. ATmega328P microcontroller. 8Mhz Clock Speed with precise crystal oscillator, 32k Flash Memory, 14 Digital I/O Pins (6 PWM outputs) + 8 Analog Ports. This board has no power regulator or other power hungry devices and the 2 LED indicators can be connected/disconnected. This board is the perfect solution for sensors or applications where you need to run it off a small battery for years. Perfect for house and car applications, etc. If you need and connect an NRF24L01+ wireless transceiver, you need to connect at least 2x 1.5V AAA cells. A coin battery can not deliver enough spike current to drive the wireless transceiver (or a wifi module). Even though you need a more powerful battery, you can still run it off the battery for years if you use the wireless feature carefully and only when needed. The wireless module can be send to a sleep mode where it needs almost no power.