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flashing_led_railroad_crossing_lights_with_a_555_timer_chip

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flashing_led_railroad_crossing_lights_with_a_555_timer_chip [2017/08/20 02:49]
adam
flashing_led_railroad_crossing_lights_with_a_555_timer_chip [2017/08/27 14:04] (current)
adam
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 Cost per unit for 50 bulk: $0.58 Cost per unit for 50 bulk: $0.58
 +
 +=== 555 Timer IC ===
  
 {{:​signetics_ne555n.jpg?​nolink&​300|}} {{:​signetics_ne555n.jpg?​nolink&​300|}}
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 {{:​ne555_monotable_waveforms_english_.png?​nolink&​300|}}{{:​275px-555_monostable.svg.png?​nolink&​300|}} {{:​ne555_monotable_waveforms_english_.png?​nolink&​300|}}{{:​275px-555_monostable.svg.png?​nolink&​300|}}
  
 +{{:​555projectdiagram.png?​direct&​800|}}
 +
 +=== 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
 +
 +{{:​resistor-color-chart.jpg?​direct&​600|}}
flashing_led_railroad_crossing_lights_with_a_555_timer_chip.1503197346.txt.gz · Last modified: 2017/08/20 02:49 by adam