Show pageOld revisionsBacklinksAdd to bookExport to PDFBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. Project Members --------------- - [Tallscreen](user:Tallscreen "wikilink") Idea ---- Make a clock which shows the time of the next train between two particular stations, based on data from the interwebs. Hardware -------- I bought a clock from a pound shop, and removed the clock-module. I took it apart, and discovered that it seems to work by sending pulses through a coil which alternate in polarity every other second. Since the clock will only be moving forwards, and usually only by 15-60 minutes at a time, I tried just driving the clock as fast as possible. Connecting the two pins to an Arduino, I managed to increase the rotation speed so that one hour passes in 36-odd seconds. This is still a bit slow - if your next train is in an hour, you don't want to stand for 30 seconds before the clock displays this properly. I've decided to make a new pair of hands, and treat the second hand as a minute hand, and the minute hand as an hour hand, so I can drive them 60x faster. Unfortunately, I can't work out how the original circuit made sure that the movement was clockwise. Currently, the direction it sets off in seems fairly random! :S Software -------- Currently very basic. Created a "tick" function to advance by one second, which energizes the coil with a polarity which depends on whether it's an odd or even second. Present Status -------------- I've recently acquired a more expensive clock module. Hopefully this will be more consistent. I need to take it apart and investigate. [Category:Projects](Category:Projects "wikilink") old/projects/next-train-clock.txt Last modified: 2022/11/30 16:31by 127.0.0.1
127.0.0.1