Black=gnd red=Vcc blue=SCL, SCK green=SDA, reset orange=ChipEnable (TFT) grey= RegisterSelect Wire-Wrapping and point-to-point soldering on the prototype board. The color varies depending on pin use, which is probably what you want (brown for "digital" pins 0/1, orange for uart0 on the same pins. There's a "common" way of documenting Arduino and Arduino-like boards that has been using a pretty consistent color code. I had a job doing wire wrapping one summer (40 years ago (!)) - they did everything in a single color :-( I'm not aware of any standardized colors for this sort of use. And there are old capacitor color codes that were sometimes followed on 20th-century electronic devices.Īre there any standard AVR/Arduino standard color coding systems that I might not be aware of?
I know that the resistors have a color band code that (roughly) follows the rainbow: black/brown/red/orange/yellow/green/blue/violet/grey/white. Standardized Arduino parts-layout-wiring software. This lets me see at a glance the entire Gnd, Vcc, or other individual trace network on the scanned image of the PCB.
I use paint-fill with a tolerance setting that allows the image of the trace to be paint filled in a different color.
Most traces will be a slightly different shade of the (usually green) solder-mask color. When reverse-engineering a printed circuit board, I scan the board with 800 dots/per/inch resolution. Scans and photos of circuit-board prototypes under development. > Plastic test-clips for custom hardware tools (like I2C sniffers, MIDI, and RS232 monitors). > Wire-Wrapping and point-to-point soldering on the prototype board.
After the Black/white diagram of the circuit, I overdraw the buses and important traces in color in software or with colored pencils on paper print-outs. I do a simple cut_and_paste of old OrCAD symbols on a black/white image in PhotoShop/PaintShopPro/GIMP instead of using Eagle or a commercial schematic-capture program. If there is a different standard in general use for these lines, then I'd like to know before getting too deep into my own color assignments. the Vin +9V (or +5V USB voltage if the AVR Vcc is +3.3V). ORANGE is for any power voltage that is not Vcc, i.e. I've assigned blue to SCL and green to SDA lines on the I2C/TWI/wire.h connections.
I have standardized on BLACK for ground/earth/0.0 volts and RED for Vcc (the main AVR voltage on the Vcc pins). I bought six spools (1000 ft/300 meters) of wire-wrap AWG30 in black, red, orange, green, blue, and gray. Int Ao = 0 int raw = 0 int Vin = 5 float Vout = 0 float R1 = 1000 float R2 = 0 float buffer = 0 void setup ( ) Ĭonnect the Resistors and Arduino as shown in the schematics and upload the above arduino code, then see the result in serial monitor.I've started using a self-defined set of color codes for my Arduino projects and I thought that I should ask if there are already some color codes in general use.
Connect the two Resistors junction point to A0 (Analog input pin 0) Arduino Code for ohm meter
Here Rx = Vx/I, by applying this circuit in Arduino, the voltage across R1 is VR1 = 5 – Vx, and then the current I = 5-Vx/R1, here R1, Rx are connected in series so the current flow through each resistors are same.Īrduino measures Voltage across Unknown Resistor using Internal ADC and performs calculations as per the code and gives unknown Resistor value.Ĭonnect +5V supply from Arduino board to unknown Resistor then connect another terminal to known Resistor (1KΩ) then ground the known Resistors another terminal. This simple schematic diagram has two Resistors called R1 (known value) and Rx (unknown value) by applying constant Vcc and then calculating Vx (Voltage across Rx) & I (Current) value will give the exact Resistance value of Rx. To know discrete Resistors Value, we use Color code technique or use Multimeter else we can use Arduino to calculate the Unknown Resistor value by using known Resistor, Voltage and Current flow.