![]() We listened and constructed a shield that offers many of the features found on PLCs. ![]() Many customers requested a ruggedized shield for the Arduino UNO/Ruggeduino and Rugged MEGA that could be used in an industrial setting as an alternative to PLCs. A stacking header kit is no longer needed to stack multiple 24V Industrial I/O Shields for more control. The New V2 includes revised components and offers additional clearances. The Rugged Circuits 24V Industrial I/O Shield is designed to replace costlier PLC systems. ![]() The GO-24V Arduino-MKR compatible shield is available on our online shop and on Tindie.Update old, dated, and clunky PLCs with a modern Arduino/Pi based system. Three 4-pin 3.5mm terminal blocks (colors may vary).One breakable male 2.54mm pin headers (0.1").void setup () What's includedĪs shown in the picture below, the Omzlo GO-24V MKR shield comes as a shield with the following unsoldered headers: Using the analog input is a bit more complex since voltages need to be scaled to match the input range.įor 12-bit analog inputs, the values returned by analogRead() will range from 0 to 4095, where 4095 corresponds to 24.75V using the default internal analog reference and assuming everything is perfectly calibrated (An analog input of 3971 should correspond to 24V). digitalWrite(SINK1, LOW) will drive the output to HIGH (e.g.digitalWrite(SINK1, HIGH) will drive the output to GND.digitalWrite ( SINK1, HIGH ) Īs noted above, if you are using the sinking output to drive a signal with a pull-up resistor, the logic is inverted: Using the sinking output is similarly simple: #define SINK1 0 Reading the digital input is as simple as reading any ordinary digital input: #define IN1 4 It is possible to apply calibration to each board to substantially increase accuracy. In terms of accuracy, the voltage divider uses 1% resistors, but the greatest source of inaccuracy can come from the ADC of the MCU itself. 24V).Īnalog inputs are managed by feeding input voltage in a voltage divider and a buffering op-amp, resulting in a scaled voltage range where 24V corresponds to 3.2V on the analog input of the Arduino-compatible board (and 24.75V corresponds to 3.3V). In that case, the logic is inverted: setting the sinking output to "high" sets VOUT to 0V, whereas setting the sinking output to "low" sets VOUT to high (e.g. Instead of switching a load, if you want to use the digital output to drive a signal between 0 and 24V (or lower), you will need to add a pull-up resistor between the sinking output and the high voltage level (e.g. ![]() In doubt, please consult the safe operating area of the MOSFET in the datasheet. Lower currents should also be considered when switching these MOSFETs very rapidly (e.g. We tested currents up to 1.5A without any issue, low-side switching power LEDs. In practice, it's best to keep safely away from those limits. The sinking outputs are controlled by MOSFETs, which have a comfortable maximum 3.1A current rating. The digital outputs are sinking outputs, which means that they are used to switch loads on the low side, as shown in the picture below. For a SAMD21 board like the Arduino MKR Zero or the Omzlo CANZERO, this means that any input below 1V will be considered LOW (0), and any input above 1.8V will be considered as HIGH (1). The digital inputs have the same shifting characteristic as the GPIO of the MCUs they are connected to. using optocouplers) or galvanic isolation. Note that this shield does not feature isolated inputs/outputs (e.g. ![]() On an Arduino MKR Zero, VIN will typically be 5V, whereas it can be anywhere between 6V and 28V on a CANZERO. The following table provides details of the shield input/output capabilities: Shield connectorĬonnected to the GND reference on the MKR board. The shield also breaks out the GND and VIN pins of the MKR board.
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