Nixie Tube Clock ‘Spectrum 18 / 1040’
Issue 7 (15 June 2018)
www.pvelectronics.co.uk
- 35 -
9. PIR MOTION SENSOR
The clock has a 3.5mm Jack Plug socket for connection of our PIR
Motion Sensor Accessory, available separately as a quick – build
kit. This useful accessory helps save tube life and power by
powering down the clock when it senses the room is empty. The
sensing range is typically up to 12 ft (3.5 metres)
When installed and configured (configuration parameter 17), the
sensor will sense motion in the room, and switch off the High
Voltage generator, tubes and RGB LEDs when the PIR time period
has expired.
Configuration Parameter 17:
0 – No PIR installed (default)
1 – 15 seconds
2 – 30 seconds
3 – 1 minute
4 – 2 minutes
5 – 5 minutes
6 – 10 minutes
7 – 15 minutes
8 – 20 minutes
9 – 30 minutes
It is important to remember that the function does not override
Night Blanking and Master Blanking, so when the clock is in Night
Blanking or Master Blanking, no amount of waving around in front
of the sensor will light the tubes! If you are using the PIR motion
sensor, the Night Blanking and Master Blanking periods are rather
redundant, so it is recommended to not use these if you have the
PIR installed.
The suggested initial PIR period is 10 minutes (Config 17 = 6).