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by wjw
Tue Jul 09, 2013 8:34 am
Forum: General programming discussion
Topic: Reading Pulse Input
Replies: 12
Views: 5340

Re: Reading Pulse Input

Thanks guys, since putting in the 1K resistor it's stopped crashing, prior to this it would crash with a gpio wfi. I will leave this bash script running for a few days to make sure its stable before I do anything else: #!/bin/bash SUBJECT="Kilowatt" EMAIL="[email protected].xxxx" while true; do gpio wfi 1 ri...
by wjw
Mon Jul 08, 2013 7:29 am
Forum: General programming discussion
Topic: Reading Pulse Input
Replies: 12
Views: 5340

Re: Reading Pulse Input

Am I right in thinking you said you connect 3V3 to the heat meter, no series resistor? If that is the case then every time there is a signal pulse you short out the RPi power supply, good way to crash it. As per the diagram I have supplied 3.3V to the signal line via a 10K resistor. The signal line...
by wjw
Sun Jul 07, 2013 9:49 pm
Forum: General programming discussion
Topic: Reading Pulse Input
Replies: 12
Views: 5340

Re: Reading Pulse Input

Am I right in thinking you said you connect 3V3 to the heat meter, no series resistor? If that is the case then every time there is a signal pulse you short out the RPi power supply, good way to crash it. As per the diagram I have supplied 3.3V to the signal line via a 10K resistor. The signal line...
by wjw
Sun Jul 07, 2013 8:43 pm
Forum: General programming discussion
Topic: Reading Pulse Input
Replies: 12
Views: 5340

Re: Reading Pulse Input

My understanding was I had to supply power via VCC, which I am doing from the 3.3V output on the Pi, with a 10K resistor between it and the GPIO pin.
by wjw
Sun Jul 07, 2013 8:29 pm
Forum: General programming discussion
Topic: Reading Pulse Input
Replies: 12
Views: 5340

Reading Pulse Input

I really hate to post this as I should be able to find the answer online, but I am getting lost in all the different ways to do it. I have a Sontex Supercal 539 heat meter for our Central heating system that gives out a pulse for every Kilowatt used. The output is as follows: Pulse Output.PNG Pulse ...
by wjw
Thu Jan 31, 2013 7:38 pm
Forum: Automation, sensing and robotics
Topic: Opinion's needed - RaspPi Engine Monitoring
Replies: 5
Views: 1321

Re: Opinion's needed - RaspPi Engine Monitoring

I don't have the option of ODB unfortunately. The engine is too old. Yes I agree about boost, from the reading I've done I'll need a resolution of around 200ms. I'm planning to output these to an LCD and if necessary the Pi won't be doing anything else as pi + hardware is less than 2 decent gauges, ...
by wjw
Wed Jan 30, 2013 11:40 pm
Forum: Automation, sensing and robotics
Topic: Opinion's needed - RaspPi Engine Monitoring
Replies: 5
Views: 1321

Opinion's needed - RaspPi Engine Monitoring

Hi All,

I'm looking at using the Pi to monitor, water temp, EGT, Boost and trans temp on my truck and output to some sort of display.

My Q is, Is Python realtime enough to perform this function? or do I need to look at something like an Arduino?

Thanks,

Bill
by wjw
Tue Jan 15, 2013 8:48 pm
Forum: Other projects
Topic: Car Monitoring and Tracking System
Replies: 4
Views: 3870

Re: Car Monitoring and Tracking System

I am in the process of building this very thing, the primary goals of my project are: * Provide Internet Access via 3G * Give wireless internet access to other devices with Mesh capability (for when parked at home) * Provide GPS tracking of the vehicle * Provide monitoring of Water Temp, Exhaust Gas...
by wjw
Thu Oct 18, 2012 8:42 am
Forum: Troubleshooting
Topic: rpi-update, now no longer boots
Replies: 68
Views: 31448

Re: rpi-update, now no longer boots

I have a similair issue, Formatted SD card with 2012-09-18-wheezy-raspbian.zip, boots first time, then if I reboot/power cycle etc it fails until I replace start.elf with a fresh version. If I dont do that I just get 6 flashes. have tried the boot_delay=1 suggestion but it makes no difference :-( Be...

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