This makes the Arduino send SMS, even though it doesn't use any GSM modules at all. Here, to send SMS alerts, I am using the Circuit Digest Cloud SMS APIs ... holding the bitmap sequence of the LED ...

Looking for practical tools to enhance your electronics design and prototyping endeavors? Elektor’s May/June 2025 edition features innovative test and measurement projects, including a crystal tester, ...

Overall, the board was more broadly heated and the internal protection circuits seems to limit the current at the TX stages to save values. The described mod enabled the modified antenna to radiate ...