Thanks BMS Doug I was planning to use expanders for the inputs and PI's GPIOs for outputs. The calculated current from the Pi to relay board is not that much but still, heating PI board a bit more. I want to use PI for home automation so I want a reliable solution avoiding anything that could lead t...

I connected my multimeter on the 3,3v and the relay VCC input. While all 8 channals were active low (meaning relaysactive), the multimeater was showing 3,7 mA (for the entire board of 8 channels) The other 8 channel relay will probably consume the same amount. So about 7.5mA both. The opto-isolator ...

Hello Pi users. Thanks for the replay. The board I bought is this one http://www.ebay.com/itm/111283816540?_trksid=p2060778.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT Two similar boards are connected to the Pi and on the 3.3v pin for 12 hours. I made Pi outputs low to enable all 16 channel. Disco...

Hello Pi users. I have two 5v 8 channel relay boards that are active low. They are working fine Pi B+ version connected direcly to the GPIO 0-7, 21-28 and 3.3v. Both relays are being powered by a saperate 5v power supply (connected to Ground and JDVCC). Pi gets hotter when relay are connected (few d...

Hi Can you connect the other Pi to the LAN port (not WIFI). This because the WIFI access point might be using so called Isolated VLAN to prevent WIFI client from accessing each other. If no ping is working in between Pis, then there is not that much that you can do. The Isolated VLAN is a good featu...

For the records. I found the solution that is good enough for me from this site http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=24491 I simply modified the /etc/rc.local file and created a new file in /etc/init.d. You have to give execute rights to the new file in /etc/init.d /etc/rc.loca...

My PHP page that runs once a user logs in, is activating relays and I do not want to do this. This is because once gpio mode is set to output, my 5V active low relay is being activated. A work around I thought was gpio write 0 1 //overrides the default state 0 (low) gpio mode 0 out this works fine a...

Hello PI users.

I have 5v relays that will be used for switching 230v device on and off. What I need is a relay that will be used to monitor 230v devices if are left on or off.

Relays that have as input 230vAC does not seem to be common. Where can I find these that can be used safly with PI?

Hello team. Thank you for the time and effort you put on this. I noticed a stupid mistake I did. The regulator is working fine but I had mistaken connected a wire on the input of the regulator, not on the output connecting PI directly to the 7.5 v but in fact, the voltage meter was showing 10v (with...

The 7.5 v PSU was connected on the L78S05CV voltage regulator and when measured the output, it was 5.05 volt. Perhaps this 0.5 volt heated up the device gradually and then caused something to brake down. 5.05v is with spec for the Pi, as the spec is 5v +/- 0.25v. I normally run Pis using the Adafru...

Hello Thank you for your replies. My wiring was correct and did not make mistake on it. I left the PI working but when came back after an hour, it was smelling and lights were off. The 7.5 v PSU was connected on the L78S05CV voltage regulator and when measured the output, it was 5.05 volt. Perhaps t...

Hello Pi users. I am new here My Raspberry PI, UK model was connected on +5 volts regulator via on GPIO pin 2 and then the ground on pin 25. This worked fine for one hour only then when I come back form the , the room was smelling burnt and the Pi was dead (no lights at all) After cooling it down, c...