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flashing_led_railroad_crossing_lights_with_a_555_timer_chip [2017/08/20 02:47] adam |
flashing_led_railroad_crossing_lights_with_a_555_timer_chip [2017/08/27 14:04] (current) adam |
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- | 1k Ohm ($0.02 - $0.09) | + | === Parts list and cost === |
- | 2.2k Ohm ($0.02 - $0.09) | + | * 1k Ohm ($0.02 - $0.09) |
- | 3.3k Ohm ($0.02 - $0.09) | + | |
- | 4.7k Ohm ($0.02 - $0.09) | + | |
- | 10k Ohm (3 x $0.02 - $0.09) | + | |
+ | | ||
- | 10nF [103] ($0.02 - $0.10) | + | * 10nF [103] ($0.02 - $0.10) |
- | 100uF ($0.05 - $0.15) | + | |
- | 1000uF ($0.18 - $0.33) | + | |
- | 555 timer IC ($0.13 - $0.25) | + | * 555 timer IC ($0.13 - $0.25) |
- | Red LED (2 x $0.03 - $0.14) | + | * Red LED (2 x $0.03 - $0.14) |
Total cost for one: $2.18 | Total cost for one: $2.18 | ||
Cost per unit for 50 bulk: $0.58 | Cost per unit for 50 bulk: $0.58 | ||
+ | |||
+ | === 555 Timer IC === | ||
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+ | {{: | ||
+ | |||
+ | === Step by step wiring instructions === | ||
+ | * 555 timer Pin 1: e2 | ||
+ | * 555 timer Pin 1: e22 | ||
+ | |||
+ | * Yellow jumper: left power bus to right power bus | ||
+ | * Black jumper: left ground bus to right ground bus | ||
+ | |||
+ | * Black jumper: a2 to left ground bus | ||
+ | * Jumper: a3 to a7 | ||
+ | * 100uF capacitor: c7 and stripe side in c8 | ||
+ | * Black jumper: a8 to left ground bus | ||
+ | * Jumper: d3 to f1 | ||
+ | * 10k resistor: j1 to j3 | ||
+ | * Jumper: b4 to f13 | ||
+ | * Red jumper: c5 to right power bus | ||
+ | * Jumper: d5 to h2 | ||
+ | * Jumper: g4 to e7 | ||
+ | * 1k resistor: g2 to g3 | ||
+ | * 4.7k resistor: j8 to j12 | ||
+ | * 2.2k resistor: h14 to h18 | ||
+ | * Black jumper: j18 to right ground bus | ||
+ | * Red LED: h12 to h13 (cathode; flat side) | ||
+ | * Red LED: i13 to i14 (cathode; flat side) | ||
+ | |||
+ | * Black jumper: Arduino GND to left ground bus | ||
+ | * Red jumper: Arduino 5V to left power bus | ||
+ | |||
+ | * Flasher should be working. | ||
+ | |||
+ | * Remove red jumper from Arduino 5V | ||
+ | * Remove red jumper between left and right power bus | ||
+ | |||
+ | * Black jumper: a22 to left ground bus | ||
+ | * Jumper: d23 to f20 | ||
+ | * 10k resistor: h20 to h22 | ||
+ | * Yellow jumper: j20 to nothing | ||
+ | * Yellow Jumper: d24 to right power bus | ||
+ | * Red jumper: a25 to left power bus | ||
+ | * 10nF capacitor: j25 to j27 | ||
+ | * Black jumper: i27 to right ground bus | ||
+ | * 1000uF capacitor: h24 and stripe side in h27 | ||
+ | * Jumper: g23 to g24 | ||
+ | * 10k resistor: j22 to j23 | ||
+ | * Red jumper: g22 to left power bus | ||
+ | |||
+ | {{: |