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--- projects:blinker:work_logs:3_electronics [2022/02/24 13:19] – tjhowse
+++ projects:blinker:work_logs:3_electronics [2022/02/27 05:40] (current) – tjhowse
@@ Line 51: / Line 51: @@
 Finally!
-The PCBs arrived and I soldered on one 25F supercap, the ISP header and two 2x1 SIL headers. I had quite a lot of trouble getting the firmware onto them, due to various issues with the USBasp programmer I was using. I eventually got some basic code onto them, charged them up from my benchtop PSU at 2.5V, and recorded a progress video.
+The PCBs arrived and I soldered on one 25F supercap, the ISP header and two 2x1 SIL headers. I set my benchtop PSU to 2.8v and connected it to the solar panel input. It started drawing several amps as the caps charged up. I quickly dialled down a 100mA current limit, and the voltage slowly increased to the limit of the zener.
+===== Programming =====
+I had quite a lot of trouble getting the firmware onto them:
+  * USB extension to my workbench was too long,
+  * 3.3v/5v selector needs to be on 5v,
+  * The firmware in the USPasp was too old to support TPI,
+  * The JP3 jumper was not installed, this is required to enable 1 MHz programming speeds,
+  * I had to use Zadig to install the libusbK v3.1.0.0 driver,
+  * Arduino IDE reporting avrdude failure when it was actually succeeding.
+After solving all of those problems I eventually got some basic code onto it and and recorded a progress video.
 ===== Video =====