Raspberry PI:

Support of RaspBerry PI hardware

Since end 2015, ArcheryClock software is also available for RaspBerry PI.

The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse.

The ArcheryClock Software requires a Raspberry Pi version 2, Raspberry Pi version 3, Raspberry Pi version 3+, or Raspberry Pi version 4. The performance of other types is not good enough for a qualified accuracy of the timing.

Installing the ArcheryClock software on Raspberry Pi is easy by downloading an image file with operating system and ArcheryClock installed. Operating system is Linux. It is installed in such a way that the system starts up with the ArcheryClock program activated.

Additionally it is possible to use the interface pins (GPIO). to control the software with external buttons. and/or using external traffic lights.

Installing on Raspberry Pi

Get the image file

Installing the software on Raspberry Pi is via an image file on a microSD card. To get the image file, sent a mail to rpi@archeryclock.com. (The file is 3GB so it needs to be sent via Large file transfer).

The file received is a zip file. Unzip the file to get the .img file (Filesize 8GB).

Write the image file to the SD card.

An SD card of 8GB is needed. To write the file to the SD card you need a program like Win32 Disk Imager.

Some 8GB micro SD cards are too small for the image file. So if you still need to buy one, buy a 16GB card. (Class 10)

Put the micro SD card in the Raspberry Pi. Your system is ready.

Finally, put the micro SD card in the Raspberry Pi. Power on. And your basic system is ready.

Optionally, the GPIO pins can be used for external controll buttons.

See connections for GPIO in next table:

(outputs is 3.3Volt when active. 0 Volt when inactive.)

(inputs, use connection to 3.3 volt to activate. And pull down resister of 1K ohm)

Typical schematics for input to GPIO pins of Raspberry PI to control the timer with external push buttons.

Important:

To use longer cables (more than 250mm), use a "pull down" resistor. A simple small 150KΩ resistor connected between Ground (pin 9) and the function pin (pin 33 in this example with next function) ensures zero voltage on the function in when the button is not pressed. If the button is pressed, the function pin still get 3.3 Volt to trigger the function. The current as result of this through the resistor is low (22μA) will not lead to power usage issues.

Typical schematics for output from GPIO pins of Raspberry PI to switch on traffic lights on mains voltage

Typical schematics for output from GPIO pins of Raspberry PI to switch on traffic lights with 12V LEDs.