![](https://rayshobby.net/wordpress/wp-content/uploads/2013/08/opensprinkler_v20s-300x225.jpg)
An open-source web-based sprinkler controller. Featuring single power supply design, built-in ATmega644 mcu, Ethernet controller, USB port, RTC, LCD, rain sensor, and expandable number of zones. Mobile web app available.
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![](https://rayshobby.net/wordpress/wp-content/uploads/2013/10/IMG_3451-300x225.jpg)
A sprinkler / irrigation extension board for Raspberry Pi. Allows RPi to directly control sprinkler valves. Featuring single power supply design, built-in RTC, ADC, and expandable number of zones.
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![](https://rayshobby.net/wordpress/wp-content/uploads/2013/11/osbo_header-300x225.jpg)
A sprinkler / irrigation extension board for BeagleBone Black. Allows Bone to directly control sprinkler valves. Featuring single-power supply design, built-in RTC, mini-relay, and expandable number of zones.
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![](https://rayshobby.net/wordpress/wp-content/uploads/2011/08/bee_header-300x225.jpg)
An open-source controller for battery-operated / latching sprinkler valves. The standalone version is powered by AA batteries and controlled remotely via RF. The shield version plugs directly into a standard Arduino .
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![](https://rayshobby.net/wordpress/wp-content/uploads/2015/01/esptoy_2-300x212.jpg)
An open-source gadget for the ESP8266 WiFi module. Built-in ATmega644, USB, color LED, thermistor, photoresistor. Make WiFi-enabled lights and sensors.
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RFToy is an Arduino-compatible microcontroller board for interfacing with radio frequency (RF) modules. Build-in ATmega328, USB-serial, 128×64 OLED display.
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![squarewear_header](https://rayshobby.net/wordpress/wp-content/uploads/2013/11/IMG_2858-300x224.jpg)
An open-source sewable Arduino microcontroller board. It’s small (1.7″) and square! Featuring built-in USB, rechargeable coin battery, color LED, buzzer, temperature sensor, light sensor.
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![](https://rayshobby.net/wordpress/wp-content/uploads/2013/08/IMG_3016-300x224.jpg)
A versatile boost converter that bumps two AA batteries to 5V. Use it for USB charging, LiPo charging, as LED flashlight, bread-board power supply. Works even on ‘dead’ batteries!
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