WIOT is an open-source, Arduino-compatible dev board for the IoT

WIOT is an Arduino-compatible board with an ESP-8266 interface and lithium-ion battery support.

The brainchild of Ubld.It Electronics’ Chris Cockrum, WIOT is an open-source, rechargeable development board for the Internet of Things.


Based on an ATmega32U4, WIOT features integrated Wi-Fi capabilities through an on-board ESP-8266 module. The extremely compact device, which measures just 3.82” x 1.02” in size, is also entirely Arduino-compatible. This lets users design and develop their connected project within the Arduino IDE.

“I designed this board to be an easy-to-use way to get connect to WiFi from an Arduino-compatible board. This will allow anyone to write Arduino compatible sketches that can easily use 802.11b WiFi using the ESP-8266 (ESP-01) Wi-Fi module,” Cockrum writes.

The Li-Ion battery powered device operates at a voltage of 3.3V with a recommended input voltage of 5V, and can run for approximately 40 hours on no sleep. Meanwhile, on-board switching enables complete power-down of the ESP-8266. In terms of I/O, WIOT includes nine digital pins, five PWM channels and six analog input channels.

“With proper power management and intermittent Wi-Fi usage, the battery can last for days to months (depending on sleep time, Wi-Fi usage, Wi-Fi transmit usage, and other peripherals) without recharging,” Cockrum adds. “Since the board auto switches between external and battery power, a USB solar charger may be connected to power the unit indefinitely.”


Key specs include:

  • MCU: ATmega32U4
  • Flash memory: 32KB
  • SRAM: 2.5KB
  • Clock speed: 8MHz
  • On-board lithium-ion battery management
  • Automatic switching from external 5V power to battery
  • Any 5V (500mA) source may be used to power and charge the unit
  • ESP-8266 Wi-Fi module (ESP-01) with updated firmware
  • Uses a through-hole mini-USB connector

Interested? WIOT is currently selling on Tindie for $45, while Cockrum has provided details on the board here.

1 thought on “WIOT is an open-source, Arduino-compatible dev board for the IoT

  1. Pingback: WIOT is an open-source, Arduino-compatible dev board for the IoT - Internet of Things | Wearables | Smart Home | M2M

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