Posts with «current» label

QRD1114 Resistor Values

Hi all,

I'm using a QRD1114 sensor for a line-follower. Datasheet: http://www.fairchildsemi.com/ds/QR/QRD1114.pdf

Im hooking it up with this schematic:

However, I'm unsure how the value for the 10K resistor was calculated? It's acting as a potential divider, right?

For the LED im guessing that the value of 220 was taken from doing:

R=(Input Voltage - Max Forward Voltage)/(Optimum forward current)

read more

Let's Make Robots 01 Jul 21:05
absolute beginners  arduino  current  divider  follower  following  limiting  line  potential  qrd1114  resistor  voltage  

Arduino Current Output

Hi there,

I have an LCD03 which i'm controlling via serial. See here: http://www.technobotsonline.com/lcd03-i2c--serial-display-32400.html

read more

Let's Make Robots 30 Jun 14:48
arduino  avr  current  draw  hirobot  hirobotblog  limitations  output