From 16fb6406eff0e965f2ebbc3f0975f4deeb53b636 Mon Sep 17 00:00:00 2001 From: Michael Ingraham <34340210+meingraham@users.noreply.github.com> Date: Fri, 23 Aug 2019 08:19:21 -0400 Subject: [PATCH] PZEM --- PZEM004T-Energy-Monitor.md | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/PZEM004T-Energy-Monitor.md b/PZEM004T-Energy-Monitor.md index a43f1349..5e12f34f 100644 --- a/PZEM004T-Energy-Monitor.md +++ b/PZEM004T-Energy-Monitor.md @@ -12,10 +12,15 @@ The PZEM-004T together with a Sonoff Basic provide a good clamp on energy monito Install Tasmota on the Sonoff Basic and confirm it is functional before connecting the PZEM-004T to its serial interface. ## Hardware connections -As the PZEM-004T expects 5V serial data and the Sonoff Basic only provides up to 3V3 the expected optocoupler input power of the PZEM-004T has to be reduced. This can be accomplished by soldering a 1k resistor between the joints shown below (modification works for version v.1.0 and v.3.0). +As the PZEM-004T expects 5V serial data and the Sonoff Basic only provides up to 3V3, the expected optocoupler input power of the PZEM-004T has to be reduced. This can be accomplished by soldering a 1k resistor between the joints shown below (modification works for version v.1.0 and v.3.0). +PZEM-004T v.1.0 +PZEM-004T v.3.0 + + + Connect the serial interface of the Sonoff Basic with the serial interface of the PZEM-004T. See pictures regarding used colors and connections. - 3V3/5V Red