Build and mount the minimum load boardThe minimum load board is a piece of stripboard that carries 5 screw terminals and the load resistors:Mounted with 4 screws and 20 mm spacers, and connected to the power supply. Note that I accidentally used the...
TestMake sure that both the switch in the front plate and the power supply switch are off. Attach a cable to the power supply and switch it on. The standby LED should be on, indicating that 5Vsb is available. 5 Vsb should really be 5 V. The other outputs...
As mentioned, I added a second (toggle) switch wired to A1 on the Arduino mini pro. The toggle has a built-in LED, so I used the Arduino 5V rail to power it.
If repurposing this board for your own projects, make sure of your pin connections before ordering the boards. You may notice an air wire in the photos: I routed the bottom LED originally from A6, which it turns out is not addressable as an output.
Required Components:The component list for this computer is fairly low as only a single IC is required: 1 x ATmega 1284P Microcontroller 1 x DIL 40 Pin 0.6" IC Holder 1 x 40 Pin Female Pin Header (to be cut down into smaller headers) 1 x 16 MHz Crystal...
The Circuit:I designed the circuit diagram in the program Fritzing as it had all the required footprints readily available. The circuit is fairly simple as the ATmega 1284P has the minimum hardware connections required (along with a 16MHz crystal) to...
Section: 1A completed TFT LCD and Touch Panel DisplayComponents Required: Printed versions of the following 3D Printed Objects from the gitHub respository: (1x) trim_tftFaceplate_keypad-display(1x) trim_tftFaceplate_facia(1x) Cube beam splitter...
Choose your PSUTake a look at the data sheet (or description of the ebay item) of your leds. It will give you the forward voltage (Fv) of your leds. Calculate the needed tension by adding the tension of the colors in your color pairs.I chose to use Red-Green...
Find approximative values for the resistorsWe will use two resistors. One (the series resistor) will limit the total current in the pair of leds, the other (the parallel resistor) will deviate part of the current to match the brightness of the brighter...
Find precise values for the resistorsOn your breadboard, make two circuits with:-Two leds in series in each (your two color pairs),-The serie potentiometers set to its maximal values in serie with the leds-The parallel potentiometers set to its middle...
Lay the componentsTake something that is flat, heat resistant, on which solder won't stick (I used some piece of marble, left-over from a bathroom floor)Lay the component with the side you want the more visible upside (I choose black side of the leds...
Add solder pasteDon't add to much, you want to avoid solder bridges and ugly solders. But you want the solder to be strong enough, so don't use too few :)You can use a needle, a toothpick... You can't use a baseball bat, it is not precise enough.On the...
SolderUse a reflow oven, a hot air soldering station... You can try cheap hot air gun or maybe a soldering iron but I tested only the oven and rework station...With my solder paste (the cheapest one on dx.com), a good setting on my reflow station is...