In the code, the RX and TX pins are assigned as software serial pins. The code (Arduino sketch) is a basic one without any dedicated SIM800L libraries. Though most SIM800L modules work on 3.7 V, my SIM800L module from a new eBay seller seems to easily lose the network connection under 4 V. The microcontroller board (Nano_V3) runs on the 5-Vdc supply, and the modem (SIM800L) gets around 4.3 Vdc. Let’s take a look at the circuit diagram, which exposes the electrical connections:Īs you can see from the schematic above, my circuit needs a stabilized and clean 5-V/1-A (min) DC power supply for proper performance. The device is, in fact, an “isolated electric switch” that can be controlled through the messaging app on your mobile phone! Here, I’m using the SIM800L and Arduino Nano V3 to develop a nifty one-channel SMS relay. This is a very simple scketch present in the examples of Ethercard libraries.It is very easy to build an “SMS-controlled relay” with the help of a cheap GSM modem module and a small microcontroller board. If you want connect this controller with an Arduino Uno you have to connect as follow: VCC - 3.3VĬS - Pin 10 # Selectable with the ether.begin() functionĪnyway the other pins can be connected to 5V signal because, as reported on datasheet, the inputs are 5V tolerant. To program an Arduino for using ENC28J60 we can use the Ethercard library by Jean-Claude Wippler. You can find ENC28J60 Micro-chip datasheet here. The Ethernet Controller ENC28J60 it’s a valid and cheaper alternative to Arduino Ethernet Schield. Print "Arduino: Hey RPI, I received a digit ", number Print "RPI: Hi Arduino, I sent you ", var # This is the address we setup in the Arduino Program
# for RPI version 1, use “bus = smbus.SMBus(0)” define callbacks for i2c communicationĭigitalWrite(13, HIGH) // set the LED onĭigitalWrite(13, LOW) // set the LED offīus.write_byte_data(DEVICE_ADDR, 0x00, 0x01)
Serial.begin(9600) // start serial for output
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