RAYSHOBBY.NET

This post is a quick update on the recent development of ESPToy. I made a video and here is a brief summary of what I covered: New version 1.22 which has added LiPo battery jack and charger (see previous announcement here). New startup demo with more polished user interface and better reliability across browsers. Overstocked […]

Read Full Post »

Today I am introducing the first version of RFToy — an Arduino-compatible gadget for interfacing with Radio Frequency (RF) modules. First, let me show you a few pictures of RFToy and a video introduction: RFToy is available for purchase at Rayshobby Store. Features ATmega328p @ 3.3V, 8MHz, with CH340G USB-serial converter and Arduino bootloader. Programming […]

Read Full Post »

A reflow oven comes in handy when you work regularly with SMT circuits. I’ve had the T-962A reflow oven for about a year now. While it has worked reasonably well, recently it has started showing some signs of aging. First of all, the total reflow time is quite long, about 15-16 minutes. This is really […]

Read Full Post »

One of the hallmarks of OpenSprinkler / OpenSprinkler Pi is the capability of expanding the number of zones. While the main controller can only interface with 8 zones, you can expand beyond 8 zones by daisy chaining Zone Expansion boards. Each expansion board adds another 8 zones. Because the zone expansion is implemented using shift […]

Read Full Post »

Voltage conversion from 24VAC to 5VDC is quite useful, because a lot of home automation devices use 24VAC, including sprinkler solenoids, home surveillance systems etc. Having a conversion module makes it easy to use a single power supply, without a separate 5V adapter for your control circuit. There are plenty of resources you can find […]

Read Full Post »