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Attiny841 : Low voltage pullup resistor
Many thanks, so the 841 is a special beast :)   It was indeed the PUE register that needed setting. I tried the 100k tip theusch posted and that pulled it down to 0.02V...
Wednesday, 29 June 2016 - 16:01
Attiny841 : Low voltage pullup resistor
Thanks for the reply.   The active code does match, except for the commented out part, which for some reason ended up in the assembly file. Heres the complete code, the...
Tuesday, 28 June 2016 - 19:32
Attiny841 : Low voltage pullup resistor
No circuit really, only ISP connected, 10k on the reset line, and a 10k external resistor that I used to test if that would pull the pin to 5V (it did). The adapter has been...
Tuesday, 28 June 2016 - 19:08
Switching power supply
The buzzer is a piezo, 15mA. The relays are prety standard, each drawing about 45-50mA. So thats the 200mA accounted for, although generally only 1-2relays will be energized. The...
Tuesday, 7 January 2014 - 13:20
Switching power supply
Thanks for the adwise, I will rig up some a test setup. The board has 2 identical chips, one making 9V the other making 5V. The 9V one will host 4 relays and a buzzer, so they are...
Saturday, 4 January 2014 - 16:46
Switching power supply
I used a TPS54231D http://docs-europe.electrocomponents.com/webdocs/0e7a/0900766b80e7a9de.pdf Datasheet does mention some energy saving mode under light load, so maybe thats what...
Friday, 3 January 2014 - 17:58
Running linux on AVR..
s/possible/practical :)
Wednesday, 28 March 2012 - 19:21
Wiznet socket and Server
For the wiznet to PHP data, you can just call a PHP script. Thats what I use with a enc, data.php?id=unique_id_of_bot&sensor1=27&sensor2=56 etc. The PHP then loops all...
Wednesday, 28 March 2012 - 12:38
MagJack for wiznet w5200
Well, I am making more than 1 board, and dont really like the module solution. Maybe the WIZ820io could work due to its small footprint, but really I am more for a complete...
Wednesday, 28 March 2012 - 05:57
Wiznet socket and Server
For the PHP side you need to decide if the wiznet will connect to the server, or the other way around. Normally the easy way is wiznet to server, since if they are on different...
Tuesday, 27 March 2012 - 17:58
Ethernet Cable
Are hubs still being used in new deployments at this age ? Just checked my local computer price database, almost no hubs listed, however the cheapest switch is 13$ for 5ports...
Thursday, 9 February 2012 - 21:05
Boot loader?
Grub may be a bit hard to fit in the 4k/8k bootloader space, more traditional bootloaders use serial... But nice work converting grub to AVR :)
Wednesday, 21 December 2011 - 19:14

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