I'm drawing a blank on this. I used to do it in BASIC (many moons ago), but now I'm thrown off.
I just want to grab each of the digits individually from an analog read.
Can I do it mathematically, or do I have to convert to Char form?
I know it's simple, but I'm outputting data on a single 7-seg display.
Maybe that's why I'm not getting any feedback.
Thanks!
The analogRead(A3) returns 16-bit data with upper 6-bit always zeros. That means that the actual data is 10-bit, and it can range from 000 to 3FF in hexadecimal number system (0 to 1023 in decimal number system). If you want to show them on 7-segment display devices at the same time, you need 3/4 display devices. If you have only one 7-segment display device, then you have to show the digits one after another with a time gap (say, 500 ms) among them.
You can use one or more of the following approaches to strip out the digits from the number (3FF/1023):
1. Use right shift method to extract hex digits.
2. Use %16 and /16 operations to extract hex digits.
3. Use %10 and /10 operations to extrcat decimal digits
4. Use itoa(int, buffer, base) function to extract ASCII codes for the digits of the number in hex/decimal.
The modulus operator (%) gives you the remainder when dividing by a number. (n % 10) will give you the least significant digit of n.
(n / 10) will strip off that digit, and the usual way to convert a number to individual digits (whether those are char or binary) is a loop that does successive modulus and division operations.
Original number: 31416
31416 % 10 = [color=red]6[/color]
31416 / 10 = 3141
3141 % 10 = [color=red]1[/color]
3141 / 10 = 314
314 % 10 = [color=red]4[/color]
314 / 10 = 31
31 % 10 = [color=red]1[/color]
31 / 10 = 3
3 % 10 = [color=red]3[/color]
3 / 10 = 0 [color=limegreen]done![/color]
westfw:
The modulus operator (%) gives you the remainder when dividing by a number. (n % 10) will give you the least significant digit of n.Original number: 31416
31416 % 10 = 6
31416 / 10 = 3141
3141 % 10 = 1
3141 / 10 = 314
314 % 10 = 4
314 / 10 = 31
31 % 10 = 1
31 / 10 = 3
3 % 10 = 3
3 / 10 = 0 done!
Golly and Gosh 
If you just need the digit characters, why not an itoa() call and then just pick off what you need. If you need them as numerics, just subtact '0':