I saw these two videos about the Voyager spacecraft and the Golden Plate each of them contain and found they fit with the other material posted here. “That’s here. That’s home. That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every…
A large part of phone automation uses DTMF signaling. DTMF stands for Dual Tone Multi Frequency and has been in place since the 1960s. Dialing a phone number before the advent of DTMF involved using a rotor. The spinning dial would generate a number of pulses that the phone company would interpret as a number. The phone company then placed each number in order and after a set number was reached, the phone company would place the call. We still…
In my earlier post I discussed installing the ESPurna firmware on the ESP-01 module, a ESP8266 based IoT device. The firmware provides a Web as well as a telnet UI. In this post we’ll be more focused on the CLI via telnet. More specifically, we’ll be looking at the wifi.scan command issued in a telnet session to determine wireless coverage. The ESP-01 module is well suited for tasks like determining wifi coverage. It is small, can operate on a small…