![]() ![]() Here’s a link with useful info about relay pinouts. I use standard 5-pin configuration for the signals: These pads are for soldering the base board and have the automotive relay form factor.Ībout this base board, schematic is really simple and is here: DSN_BASE_RELE_5P_V01. I also put a connector for microcontroller serial port, I use it on debug stage, to send ADC values and check the accuracy of the measurement.Īs you can see, on the top right of the board (TOP LAYER) there’re four pads, and there’s another pad in the middle right of the bottom layer. I also add a user led (D1) and two leds on series with the SSR input that lights when SSR is activate. Network resistors are configured to measure up to 15V, adjusting this voltage to maximum 4.096V input voltage on PIC using internal voltage reference (FVR). I add a MOSFET on the input stage to protect the device against polarity inversion when connect the battery. The schematic of the control board is here: DSN_CONTROL_BATERIA_V01. One for the electronics and another one for the base, where goes the faston connectors. Test with this board are also OK, so I design a PCB with all. Output ratings are 30V / 1A, so perfect to connect a external relay. AQY211EH: SSR with reinforced isolation of 5kv. ![]() On memory stage, it has 4K words and 256 RAM bytes, enough for the application. Interesting for this poject: internal oscillator (I use 8Mhz freq), ADC on any GPIO pin and internal voltage reference (selectable between 1.024V, 2.048V or 4.096V). Same 8-bit architecture but with many peripherals and under 1 eur /piece. PIC16F1824: A new device (for me) from Microchip. ![]() Input voltage goes up to 35V and the consumption of the board is really small, so with a 500mA output current is more tan enough.
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