If they are not rated at 100-240 vac, you cannot switch them with that SSR. You stated you where trying to switch 25 watt led’s on and off but you never stated what their rated voltage was. The reading of 682 on the meter diode setting would indicate the SSR is switching on, that’s the voltage drop across the triac, 682 millivolts is what you’d see for a typical silicon device. More importantly, you’re not measuring resistance on that meter setting, you’re measuring voltage drop as the “diode” test function being used does not measure resistance. SSR AC side, port 1, conductivity between screw 1 and screw 2 when high, measures 1.Īs Wawa mentioned, you will not get a zero resistance across an SSR when it is on. SSR AC side, port 1, conductivity between screw 1 and screw 2 when low, measures 657. SSR pin 3 (CH1) to GND (when high) = 1 (no conductivity)ĥV (on any pin) to GND (on any pin)= 4.99V measure SSR pin 3 (CH1) to GND (when low) = 0 (full conductivity) R2 will not left much base current flow, on the order of 0.5mA, so the transistor won't turn on hard, Vbe will be high, the diode D1 drops some of the 5V before the transistor.Ĭan you measure Pin 3 of the SSR to Gnd when CH1 is low and tell us what you see? PNP transistor, CH1 has to be Low to turn it on to allow current flow into Pin 3 (and the indicator LED) to turn the device on. SSR 5V goes to 5V bus (I removed the 17V from the wiring) CH1 goes to an Arduino pin, 5V is where you connected the 5 to 17V, and Gnd is connected to Arduino Gnd?
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