For the challenge, I wanted to send data from my computer's real serial port (RS232 9-pin connector). For that, I created an adaptor circuit because the voltages on a computer serial port are ...

The QR701 thermal printer is a compact and versatile printing solution that can be easily integrated with Arduino and Wemos platforms. This guide provides instructions on how to set up and use the ...

わけあってRS232とEthernet変換機が必要だったんですが、買うと結構高いので、ちょうど我が家に眠っていたArduino Nano Everyを使って作ってみました。実際は、ちょっと単なる電文のやり取りじゃなくて、ちょっとだけ文字列操作が必要だったんです。 GitHubに ...

Today, GSM networks are widely-used, whether for making calls or sending SMSes. But some places need urgent messages like in colleges, railway stations, events, share market and so on, and this ...