Fully Arduino compatible with Arduino PRO Mini 3.3V @ 8MHz bootlader

• NRF24l01+ radio breakout port

  with CE and CSN pins connected to digital pins 7 and 8 ( you use RF24 radio(7, 8); in Arduino code). There is a 4.7uF capacitor connected across Vin and GND of the port

• bigger LDO voltage regulator

  The board comes with an AMS1117 3.3V as a standard. It can be equipped with a MICROCHIP TC2117-3.3VDBTR or ADP3338 upon request.

• two breakout ports with SDA, SCL lines

  and 10k pull-up resistors for external I2C components, connected to A4 and A5

• DHT11/22 port

  with 5.1k pull-up resistor and connection to D5

• ESP8266 ESP-05 port

  breakout pins are for power supply and GND connections. Top one is power, bottom one is GND. RX and TX pins are not connected to ATMega328p, not to interfere with programming.

• 1.25amp 30V n-channel MOSFET

  for regulating external components such as solenoids. The gate is connected to D4 and the output is protected with a Schottky diode.

• low power (2mA) LED diodes

  that are connected via solder jumpers. Jumpers need to be soldered in.

There are few such boards available and none with this kind of versatility.

This board is perfect for low-power applications. Identical - small - footprint as Arduino PRO. Only better. It is intended for sensor applications and can be used as an universal board for sensor node networks. Dimensions are 2 inch x 2.1 inch. The board is 1mm narrower than Arduino PRO, to fit into 2inch slot of an enclosure.