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pcb for freeMdu adapter based on ESP32-S3 (request by Severin) pcb not desigend /routed starting point for board that fits specific machines.

pcb for freeMdu adapter based on ESP32-S3 (request by Severin)
pcb not desigend /routed starting point for board that fits specific machines.
@PatMan6889
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PatMan6889 commented Jan 12, 2026

Maybe you can consider this schematics for your design. It has transistors and a schmitt-trigger.
Works very realiably on my electricity meter for years now. SML uses at least 9600 baud.
ir_schreib_lesekopf_ttl_neu_v1_stromlaufplan
https://wiki.volkszaehler.org/hardware/controllers/ir-schreib-lesekopf-ttl-ausgang

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2 participants