oak:tutorials:ultrasonic_2
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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oak:tutorials:ultrasonic_2 [2017/01/09 22:07] Rover#18 [Components] noted voltage divider alternative |
oak:tutorials:ultrasonic_2 [2017/01/09 23:55] Rover#18 [Alternative Circuit: Voltage Divider] |
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| GND ---+------- GND | GND ---+------- GND | ||
| </code> | </code> | ||
| + | |||
| + | {{http://digistump.com/wiki/_media/oak/tutorials/oak_hc-sr04_voltage_divider_echo.jpg?300}} | ||
| + | |||
| + | Alternative build option using voltage divider instead of level shifter | ||
| + | |||
| ===== Code ===== | ===== Code ===== | ||
| Line 105: | Line 110: | ||
| int LEDPin = 1; // Onboard LED | int LEDPin = 1; // Onboard LED | ||
| - | long duration; | + | long Time_Echo_us; |
| long inches; | long inches; | ||
| Line 149: | Line 154: | ||
| <code> | <code> | ||
| - | // pulseIn HIGH starts measuring the time until it hears the echo | + | // pulseIn HIGH starts measuring the time until it hears the echo |
| - | Time_Echo_us = pulseIn(echoPin, HIGH); | + | Time_Echo_us = pulseIn(echoPin, HIGH); |
| - | // Calculate distance to object. Divide by 2 because echo time is roundtrip | + | // Calculate distance to object. Divide by 2 because echo time is roundtrip |
| - | inches = (duration/2) / 74; | + | inches = (Time_Echo_us/2) / 74; |
| </code> | </code> | ||
oak/tutorials/ultrasonic_2.txt · Last modified: 2017/01/09 23:55 by Rover#18
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