Go to advanced search

by anddr
Mon May 23, 2016 10:08 pm
Forum: Beginners
Topic: Arduino + Raspberry Pi connection through 3.3 and relay?
Replies: 10
Views: 2984

Re: Arduino + Raspberry Pi connection through 3.3 and relay?

Yes, it is possible to use a relay.
I would just have used a voltage divider, you can find a potentiometer in alot of scrap electronics ( volume knobs etc.)

Greetings from Norway
by anddr
Wed Jan 09, 2013 7:26 am
Forum: HATs and other add-ons
Topic: how to sense 220v input -solved- I hope
Replies: 59
Views: 61708

Re: how to sense 220v input -solved- I hope

I used C1 and R1, when using H11A1 you must drop D1 as the chip has it internally.
by anddr
Mon Jan 07, 2013 12:51 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Help with RTC
Replies: 19
Views: 16025

Re: Help with RTC

Hi! If you want to use the waiman rtc on raspberry pi, you have to remove R2 & R3 @ 332 so SDA and SCL is not pulled up to 5v. But you have to power the DS1307 from 5V or else it will think it is powered by battery and shut down SDA and SCL. When done like this the RTC module operates at safe logic ...
by anddr
Mon Jan 07, 2013 9:25 am
Forum: HATs and other add-ons
Topic: how to sense 220v input -solved- I hope
Replies: 59
Views: 61708

Re: how to sense 220v input -solved- I hope

http://www.simple-electronics.com/2012/ ... rface.html

I used the resistor values from that site, threw away the 4N25 and transistor for a H11AA1, and voila!

Works really well on my Arduino, to use it on RPI just feed it 3.3v instead of 5v. :)

Go to advanced search