![]() When the output is high transistor T1 is conducting current and the relay is latched when low relay is released. When we press the button pin 3 goes low and the capacitor goes 0V, when we press the button again output goes high again, so we have toggle functionality. ![]() So when output is high capacitor has +5V. When the button is pressed capacitor voltage appears on pin 6 and 2 and output pin 3 changes state as well as capacitor voltage changes. When output pin 3 is high then capacitor C1 is charged and when it’s low capacitor is discharged. Pins 6 and 2 of 555 timer are at half power voltage. The circuit toggles a relay when button S1 is pressed. The Schematic for this circuit can be seen above. ![]() We added a relay on output, an indicator led as well as connectors for power, external push button, and relay contacts. Inspiration from this project and circuit is found here. The circuit is powered from +5V and there are connectors to connect the controlling device. The circuit is built around a 555 timer configured in a way that let it latch on one state and action is required to change state. In that way, you can control power to a device using one push button. This kind of switch works by latching a relay to ON state with the push of a button and with another push latch is released. By “soft touch” we mean that you have to push once to set the device ON and push again to set the device OFF. Pi Supply Switch printed circuit board (PCB) v1.This project describes how to build a “soft touch” switch.Please Note. This product requires some simple soldering assembly. What makes the Pi Supply Switch superior to other makeshift solutions available is that it allows you to restart the Raspberry Pi using the sudo reboot command without the power turning itself off. Pi has been frozen for a long time) as it risks corruption of the files on your SD card if done at the wrong moment. Remember to only use this button when absolutely necessary (e.g. There is also a hard power off button for use in emergencies which immediately cuts the power to your Raspberry Pi. From this point, once again, all you would need to do to restore power to the Pi is touch the on button. Then, a couple of minutes after the full and safe shutdown, the Pi Supply Switch cuts the power to the computer. Once you've finished using your Raspberry Pi, simply shutdown using the sudo halt command. ![]() Also includes a free Pi Supply sticker. The circuit is packaged into a small profile so that it fits neatly into your workstation. ![]() The kit comes complete with one of the Pi Supply printed circuit boards, as well as all of the parts you need to put it together into a working unit, including a flat noodle USB cable to connect to your wall-wart power supply. It allows you to leave all of the power wires from the “wall wart” to the Pi permanently connected, but allows you to switch the power to the Pi on or off with just the quick push of a button! Simple! The Pi Supply Switch is an essential piece of kit for all Raspberry Pi users! The unit acts as an “intelligent”, ATX style power supply switch for the revolutionary Raspberry Pi computer. The Pi Supply Switch is the solution to all of your Raspberry Pi power management problems. ![]()
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