Difference between revisions of "Project:Traffic Lights"
Jump to navigation
Jump to search
(→Wiring) |
|||
| (3 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
| + | |||
| + | '''The traffic light no longer exists as it went missing :(''' | ||
'''Warning: You should read and understand this document ''in full'' before opening or hacking on the traffic light''' | '''Warning: You should read and understand this document ''in full'' before opening or hacking on the traffic light''' | ||
| Line 23: | Line 25: | ||
The traffic light is powered from 90-250v AC (50/60Hz). The controller contains an AC-DC convertor to bring it down to the 3.3V required by the ESP8285. The 4 relays output mains voltage, which is then dropped down to ~12v AC by an individual transformer ''per bulb''. | The traffic light is powered from 90-250v AC (50/60Hz). The controller contains an AC-DC convertor to bring it down to the 3.3V required by the ESP8285. The 4 relays output mains voltage, which is then dropped down to ~12v AC by an individual transformer ''per bulb''. | ||
| + | |||
| + | It was suspected that the transformers were generating Electromagnetic Interference (EMI) when switching on and off, so an off the shelf snubber has been put in parallel with each. A commercial filtered IEC socket has also been added. Since these modifications no further EMI problems have been reported. | ||
====Lamp to GPIO mapping==== | ====Lamp to GPIO mapping==== | ||
{| class="wikitable" | {| class="wikitable" | ||
| − | ! style="font-weight:bold | + | ! style="font-weight:bold;" | Function |
| − | ! style="font-weight:bold | + | ! style="font-weight:bold;" | GPIO Pin |
|- | |- | ||
| style="background-color:#ffffff;" | Red Lamp | | style="background-color:#ffffff;" | Red Lamp | ||
| Line 41: | Line 45: | ||
=== Bulbs === | === Bulbs === | ||
| − | The "real" bulbs for these traffic lights are 12V, 50W Halogen Bulbs with a GY6.35 base from General Electric, however they have been replaced with generic 4W LED bulbs to reduce the brightness and power consumption. | + | The "real" bulbs for these traffic lights are 12V, 50W Halogen Bulbs with a GY6.35 base from General Electric, however they have been replaced with generic 4W GY6.35 LED bulbs to reduce the brightness and power consumption. |
There is 2x spare LED bulbs inside the amber section of the traffic light. | There is 2x spare LED bulbs inside the amber section of the traffic light. | ||
| + | |||
| + | '''Note:''' It turns out G4's will fit in the bulb holders. These are cheaper than GY6.35s and much easier to get hold of - Poundland stocks 3x 20W Halogen G4s for £1, or you can get LED G4s from £1 each on Ebay. My suggestion would be to use G4s in future. | ||
=== Programming === | === Programming === | ||