Hi Guys,
I'm new to the forum but not new to Raspi or linux.
My 7yr old and I currently building a project using the relay pcb mentioned in :-
http://www.raspberrypi.org/phpBB3/viewtopic.php?t=36225
and connecting it via a prototype pcb :-
http://www.ebay.co.uk/itm/161089489989? ... 1497.l2649
Many years ago I modded an Xbox to run linux and xbmc using a chip kit. The kit came with some sprung/telescopic pointed pcb pins that allowed the mod pcb to piggyback the pcb bellow and make connection by pressure contact. We'd love to use these pins to connect our proto-board to TP1 & TP2 but I have no idea of their correct name.
Google and ebay have yet to come up with an answer. Does anyone out there have any ideas?
Many thanks
Sean & Vanya
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blackdog65
- Posts: 5
- Joined: Mon Sep 23, 2013 4:14 pm
- Location: Cambridgeshire
Re: Connecting prototype pcb
Pogo pins?
Why are you specifically trying to connect to TP1 and TP2? You'd likely get a much better connection if you connected directly to the P1 header using a 2x13 female IDC socket (or just individual DuPont connectors).
Why are you specifically trying to connect to TP1 and TP2? You'd likely get a much better connection if you connected directly to the P1 header using a 2x13 female IDC socket (or just individual DuPont connectors).
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blackdog65
- Posts: 5
- Joined: Mon Sep 23, 2013 4:14 pm
- Location: Cambridgeshire
Re: Connecting prototype pcb
The plan was to supply 5v to the proto-pcb and from there power the pi and relay pcb. ( copying http://www.raspberrypi.org/phpBB3/viewtopic.php?t=36225 ) but I was reluctant to solder directly to my Pi.
Is pin 1 common to TP1? If so it would make things a lot simpler.
Many thanks for replying so quickly!
Is pin 1 common to TP1? If so it would make things a lot simpler.
Many thanks for replying so quickly!
Re: Connecting prototype pcb
The schematics are available 
http://elinux.org/RPi_Hardware#Schematic_.2F_Layout
And checking those shows that both TP1 and pins 2 and 4 on header P1 connect directly to the +5V0 rail in the Raspberry Pi (and similarly both TP2 and pins 6, 9, 14, 20 & 25 all connect directly to the GND rail). Which means that the post that you linked to has absolutely no reason to solder directly to TP1 and TP2 rather than just using the provided connections on header P1
Edit: In fact this is already mentioned in the forum thread you linked to http://www.raspberrypi.org/phpBB3/viewt ... 72#p312472 so I guess you didn't bother reading the whole thread?
http://elinux.org/RPi_Hardware#Schematic_.2F_LayoutAnd checking those shows that both TP1 and pins 2 and 4 on header P1 connect directly to the +5V0 rail in the Raspberry Pi (and similarly both TP2 and pins 6, 9, 14, 20 & 25 all connect directly to the GND rail). Which means that the post that you linked to has absolutely no reason to solder directly to TP1 and TP2 rather than just using the provided connections on header P1
Edit: In fact this is already mentioned in the forum thread you linked to http://www.raspberrypi.org/phpBB3/viewt ... 72#p312472 so I guess you didn't bother reading the whole thread?
Last edited by AndrewS on Wed Sep 25, 2013 11:38 am, edited 1 time in total.
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blackdog65
- Posts: 5
- Joined: Mon Sep 23, 2013 4:14 pm
- Location: Cambridgeshire
Re: Connecting prototype pcb
Brilliant! Many thanks for your time and help.
I'll proceed happily now
BTW... what part of Cambs are you in? I'm up Wisbech way.
I'll proceed happily now
BTW... what part of Cambs are you in? I'm up Wisbech way.
Re: Connecting prototype pcb
You are bypassing the Pi's fuse by connecting to either the test points or the header pins, so do it at your own risk, or simply add a fuse to your development board. You could do something similar to what I have done here with my Sainsmart card. See the following images to see how I connected my pi to the Sainsmart relay card and powered up everything. "Top Right Circuitry View (Relay Interface Quadrant)" and "Lower Right Circuitry View (Raspberry Pi Quadrant)":
http://hellmet.x10.mx/launch/Copied-Home.php
Get a couple of cheap usb cables with 24 AWG power leads (You can get them for like a dollar from Monoprice), and cut off one end. Run the wallwart or other power supply to a terminal block on your development board. From there you can run a usb cable from another terminal block to your pi. You can then power the relay card with a couple of jumper cables. If you decide that you need to turn on all relays at the same time, be aware that it will take around 480ma, so make sure your power supply can accommodate that plus the pi's power; I power the relay card and pi from separate supplies by removing the 3 pin jumper on the relay card (Actually the same supply but separate 1 Amp ports).
http://hellmet.x10.mx/launch/Copied-Home.php
Get a couple of cheap usb cables with 24 AWG power leads (You can get them for like a dollar from Monoprice), and cut off one end. Run the wallwart or other power supply to a terminal block on your development board. From there you can run a usb cable from another terminal block to your pi. You can then power the relay card with a couple of jumper cables. If you decide that you need to turn on all relays at the same time, be aware that it will take around 480ma, so make sure your power supply can accommodate that plus the pi's power; I power the relay card and pi from separate supplies by removing the 3 pin jumper on the relay card (Actually the same supply but separate 1 Amp ports).
Last edited by pjc123 on Wed Sep 25, 2013 11:56 am, edited 1 time in total.
My Raspberry Pi Project Page:
https://www.flaminghellmet.com/launch/
https://www.flaminghellmet.com/launch/
Re: Connecting prototype pcb
Cambridge City itself, between Mill Road and the (now 'international' !) airport.blackdog65 wrote:BTW... what part of Cambs are you in? I'm up Wisbech way.