Ultrasonic sensor and LED Bar Graph

Comments

1. mamad # June 1, 2012, 6:19 p.m.

   plc send the shemstic

2. HANKENSTIEN # June 4, 2012, 8:36 a.m.

   IS it safe to run this without some resistors in line with the leds?

3. HANKENSTIEN # June 4, 2012, 8:39 a.m.

   Also why do you run power and negative to the top rail it doesn't look like it connects to anything., I'm curious, Because, im looking for a similar experiment. Thanks for sharing!

4. wese3112 # June 20, 2012, 2:58 p.m.

   You can't use the LEDs like that, they need a current limiting resistor wired for each one. Use 150 Ohms if you want to achieve max. brightness (~20mA) or 1k Ohms for 'normal' brightness. There are special LEDs that have a built-in resistor, but these are very uncommon to use. By the way: Thats an infrared proximity sensor, not an ultrasonic one.

5. electronist # June 23, 2012, 6:50 p.m.

   I didn’t add resistors just for the sake of circuit simplicity, of course you can add a 230 Ohms resistor. The maximum output current from each pin of the Arduino is 40mA. I haven’t used LEDs, I have used an LED bar graph. I used this sharp infrared sensor because I couldn’t find the ultrasonic one on the fritzing library. HANKENSTIEN….I don’t quite understand your question ! Have a look at this: http://karimbaali.com/tutorials/arduinoprocessing/sensors/ultrasonic-sensor-led-bar-graph/