Technovative writes, “The purpose of this article, is to show a simple method to increase the power efficiency, and functionality, of standard DC actuated electromagnetic relay switches.”
Project instructables here.
James Lewis shares his experience in debugging SONOFF AC relay with a thermal camera:
The clever solution seemed to be clever, at least for a few minutes. Suddenly the light turned off. I thought maybe there was a timeout for the manual button. Annoying, but workable. The lamp remained off for about another 2 minutes when I started to smell that unmistakeable burning plastic odor. Touching the case of the SONOFF identified the culprit immediately.
Great. So I have an AC mains switch that isn’t working, but I do not want to go poking my multimeter into it. What do I do?
Turns out, that SONOFF module was defective. I wanted to debug it, but I did not want to measure anything while connected to AC. Here’s how I used a thermal camera to debug my SONOFF.
See the full post on Bald Engineer blog.
Raj has documented his DIY programmable relay switch using PIC16F1847 microcontroller:
Here are the summary of the features that this programmable relay switch has:
- On-board +5V voltage regulator (operates at 9-15V DC input)
- OFF and ON time setup for the relay operation
- Option for cyclic run (maximum 100 cycles, after which the timer stops automatically)
- Stores ON/OFF times and Cyclic option from previous setup into internal EEPROM
- ON/OFF timing range: 0 to 99 hours and 59 minutes with 1 min resolution
- Interactive user interface using 4 tact switches and a character LCD
- On-board buzzer alarm
More details at Embedded Lab site.
Check out the video after the break.