When you boot the Raspberry the first time, Raspbian will look for these and connect to your Wifi. Use Save As “All files” to K:\wpa_nfĪgain, do not let Notepad change it to “wpa_”!! Must NOT be “ssh.txt”!!!ģ) With notepad, create a second file called “wpa_nf” with following:Ĭtrl_interface=DIR=/var/run/wpa_supplicant ĭid you know?If you install Raspbian on an SD card using a PC, you can create two files on the card to configure WiFi and SSH access before you boot it on a Raspberry?įor this, assume your SD card is currently mounted as K: on your PC:ġ) Install the latest Raspbian Lite image to the SD.Ģ) With notepad, create a file called just “ssh” and use Save As “All files” to K:\ssh On Mac, just bring up a command terminal window. On Windows, you can use PUTTY SSH terminal program. You will need to access the Raspberry remotely via SSH.You DO NOT need the GUI version, as this project does not use a monitor or keyboard. If you haven’t already, install Raspbian Lite version onto a 4GB or larger microSD card.Install Raspbian Stretch Lite onto a 4GB or larger SD card. Optional: 5v 1amp battery (used to charge a cellphone) Such as Anker PowerCore 5000 Portable Charger Alternately, you can use a LiPo battery 5v converter/charger Or 5V 2amp power supply for home use.Breadboard, Pi Breakout cable/connector to breadboard, wire.Small Speaker (I salvaged a 2” speaker from old PC speakers).I2S 3W Class D Amplifier Breakout - MAX98357A.MakerFocus 0.91 Inch I2C SSD1306 OLED Display Module Amazon (or other SSD1306 128x32 OLED display).(Anytime it is within range of your WiFi, if you are using a Raspberry Zero W.) The Raspberry Pi clock and RTC will resync to Network Time Protocol (NTP) servers whenever it connects to the Internet. The “WWV” software, written in Python, displays the time and plays the appropriate audio. Note that the case will need to be large enough to install a battery, if you want portability! “ Mark !” The recording could then be transcribed with the sightings and timestamps in the comfort of home.įor those with such nostalgia, be sure to dig up an old transistor radio (and remember those?) to use as a case for your project. Most uses? Well, besides falling to sleep to the droning sound of WWV, I used the shortwave radio version to timestamp astronomical observations using a tape recorder (remember those?), I would record meteor observations, lunar occultations* or other events I saw, with WWV time signals in the background. Otherwise, for most uses, the accuracy is probably sufficient. (See precision time keeping with Raspberry Pi articles, such as. You can improve this by using a higher quality (more expensive) RTC, or by just leaving the Raspberry Pi connected to the Internet, but this would never replace the atomic clocks of the real WWV. Unlike the real WWV, the audio time signals as well as the admittedly tiny clock display will be only accurate to about one second of drift per day using the typical low-cost RTC module. Isn’t that what you always wanted?Īctually, this is a project to help show you how to connect a tiny OLED screen, a real-time clock (RTC) and an audio amplifier all to a single Raspberry Pi Zero! All with the bonus of being able to listen to WWV time “signals” anytime you wish. Oh! You missed out on that? Now you can (re-)experience those moments and have your own WWV clock, no shortwave radio and no Internet connection required. Remember the days when you would sit listening to WWV time signals on your shortwave radio (tick, tick, tick… At the tone, the time will be…)? Intro: RaspiWWV - Simulated WWV Shortwave Audio Time Broadcast
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