Overview

The Zero Tiny BLE is a small low cost and low powered embeddable board with an AVR ATTiny85 microcontroller and a Bluetooth 4.0 (Bluetooth Low Energy or BLE) radio.

• AVR ATTiny85 microcontroller running at 8MHz internal clock and 3.3V. ATTiny85 Datasheet.
• HM-10 Bluetooth 4.0 Low Energy module. HM-10 Datasheet.
• Powered by single cell 3.7V Lithium Polymer battery (LiPo) or USB B mini port.
• LiPo battery recharge capabilities via the USB B mini port.
• Standard UART communication over Bluetooth 4.0.
• Communicate with iOS or Android devices that have BLE capabilities (most newer models do).
• Easy prototyping via breadboard.
• Use either Arduino or AVR-GCC development environments.
• Completely open source. OshPark and GitHub
• Small form factor of 20mm x 47mm (0.79” x 1.85”)

Pinouts

Programming Notes

• See our Getting Started Guide
• The ATTiny85 cannot be programmed in circuit. It must be removed and a separate programmer such as the excellent Sparkfun Tiny AVR Programmer.
  
• The ATTiny85 pins PB3 (RX) and PB4 (TX) are reserved for serial communication with the Bluetooth 4.0 radio.
• The ATTiny85 does not have hardware UART serial. The Arduino SoftwareSerial library should be used. Example:

``` #define rxPin 3 #define txPin 4 SoftwareSerial _bluetoothSerial = SoftwareSerial(rxPin, txPin);

void setup() {
    // initialize serial communications at 9600 bps:
    _bluetoothSerial.begin(9600);
}

void loop() {
     _bluetoothSerial.print(“Hello World”);
}

• Important: make sure that when programming your ATiny85 in the Arduino IDE that the board is set to “ATTiny85 (internal 8MHz)”