Post Created date
Missing third byte with buffered interrupt driven UART, but NOT when debugging
A bit more thought and some surfing around a fairly generic AVR spec sheet confirms this.  Here is what I think is happening:   Chronologically: 1) Transmitter enabled,...
Friday, 15 January 2021 - 10:57
Missing third byte with buffered interrupt driven UART, but NOT when debugging
Reeks of trying to process too many interrupts too fast.  The AVR won't queue two of the same interrupt.    Also, is it every third, or only just the third? ...
Friday, 15 January 2021 - 10:34
PCB - how to separate ISP and I2C ???
jussishow wrote: You don't need to blow the RSTDISABL fuse to use the RESET pin to drive a tri state !  I've got a 74HC4053 multiplexer with the selects connected to the...
Friday, 15 January 2021 - 09:24
Bypass caps 'Hands on demo' help ...
12oclocker wrote:A 0.1uF is a very standard recommendation by most MCU companies to be placed close to the MCU and is a bare minimum in my opinion, it assumes a clean vcc supply...
Friday, 15 January 2021 - 05:40
Bypass caps 'Hands on demo' help ...
Noise source suggestion:  Hook up a stepper motor driver.*  A nice beefy one, like an LMD18201 (half-bridge), or built out of discrete TO-220 MOSFETs.  I had an AVR...
Friday, 15 January 2021 - 05:21
Using battery and no switch
Shouldn't need an HV programmer.  The AVRs I've met (granted, not all of them) their lock bits merely prevented reading without a full chip erase.  But the full chip...
Friday, 15 January 2021 - 01:15
Using battery and no switch
With a bit of thought, it struck me that some voltage regulators (VREGs) have 'enable' pins, and you could use a big capacitor (1F or so) downstream of the VREG such that when the...
Friday, 15 January 2021 - 00:44
Bypass caps 'Hands on demo' help ...
Hitchhiker's Guide, Douglas Adams.  S.
Thursday, 14 January 2021 - 14:19
PCB - how to separate ISP and I2C ???
phil1234567 wrote: and indeed the RESET line could be use to drive a tri state   Unless you really need it, don't monkey with the RESET pin.  That way leads to a lot of...
Thursday, 14 January 2021 - 14:02
PCB - how to separate ISP and I2C ???
Cricket is a game that involves throwing things at people with sticks, the idea being that if the thing is hit with the stick then it goes somewhere else and everyone runs around...
Thursday, 14 January 2021 - 13:56
Bypass caps 'Hands on demo' help ...
You just throw yourself at the ground and miss.  S. .
Thursday, 14 January 2021 - 12:10
Bypass caps 'Hands on demo' help ...
Gravity IS a myth.  It's just that we're living on a really sucky planet.     S.
Thursday, 14 January 2021 - 08:15

Pages