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--- projects:blinker:work_logs:3_electronics [2022/01/31 04:23] – tjhowse
+++ projects:blinker:work_logs:3_electronics [2022/02/24 13:19] – tjhowse
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+~~NOCACHE~~
 ====== The Electronics======
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 D renders. The capacitors are actually 38mm high, far more than shown here, but I don't know how to resize the models used in this render.
+===== The Waiting =====
+Unfortunately I timed the PCB order to perfectly align with Chinese new year.
+{{:projects:blinker:work_logs:pasted:20220203-003706.png}}
+===== Assembly =====
+{{:projects:blinker:work_logs:pasted:20220224-131812.png}}
+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.
+===== Video =====
+{{ youtube>G8RZ3I4DSik?large }}
 ===== Next Time =====
-There are a few major shortcomings to this design. It does not efficiently collect energy from the solar panel. I could get some extra energy by employing Maximum Power Point Tracking (MPPT). Also, the useful voltage range of the capacitors is between 1.8v and 2.4v. The maximum is set by the zener diode, and the minimum is set by the microcontroller. If I used a boost converter, such as a LM27313, TPS6122x, LTC3108 or TPS61021, I could decrease the usable minimum capacitor voltage to 0.5v, giving us more available energy over a full discharge.
+There are a few major shortcomings to this design. It does not efficiently collect energy from the solar panel. I could get some extra energy by employing Maximum Power Point Tracking (MPPT). A single ZSPM4523AA1 would give me MPPT, reverse current protection (replacing the schottky diode) and voltage regulation (replacing the zener diode). Also, the useful voltage range of the capacitors is between 1.8v and 2.4v. The maximum is set by the zener diode, and the minimum is set by the microcontroller. If I used a boost converter, such as a LM27313, TPS6122x, LTC3108 or TPS61021, I could decrease the usable minimum capacitor voltage to 0.5v, giving us more available energy over a full discharge.
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