tarakan wrote:I am planning to post this project somewhere as "open source", with a full description, for other elbow-biters like myself to learn from.

That is why mikroElektronika created:

The "Oscillator Selection" should be HSPLL, the "USB Voltage Regulator" should be enabled and the frequency would be 48MHz instead of 8MHz.

If you have are using the 8MHz crystal then the frequency for mikroC would be 48MHz. If you use a 48MHz crystal then the settings will not work. Since touching the crystal is messing up it means that the crystal is not working, the connection is bad (even it looks okay) or the 22pF capacitors are in...

USB runs on its own clock or on the same clock that the processor runs on? The main clock is copied and then routed (depending on you settings) to both. What are the reasons to separate them or to run them off the same clock? The USB can only run from 48MHz but some people might want to run the CPU...

mikroE already has a topic explaining the oscillator here (great topic): http://www.mikroe.com/forum/viewtopic.php?t=10646 You can use the 48MHz and in that case you need to follow the top route of the oscillator block to get USB to use 48MHz directly. The MUX lets you select which of the inputs to ...

Look at Figure 2-1 in the datasheet for PIC18F2455, it maybe a bit confusing but it explains the clock options in one diagram. Your objective is to bring 48MHz to USB Peripheral and any speed you want to the output of the MUX that goes to the rest of the Peripherals and the CPU. Table 2-3 in the dat...

Try this project, it is meant to help people get started using USB and Microchips HID Bootloader: http://www.libstock.com/projects/view/55/microchip-hid-bootloader-template-and-adc-over-usb-for-pic18f-and-pic24f-pic18f14k50-pic18f27j53-pic18f2553-pic18f4553-pic24fj64gb002-tested If should be very he...

I don't see a 0.47 uF capacitor to ground on pin 18, VUSB. There are two flesh-colored sausages. They are labeled 104. PIC18F2455 only needs 220nF (he has 2x100nF), but a higher capacitance is not a problem. I would suggest adding one more 100nF capacitor since the nominal value right now is a litt...

I haven't tried all the fuse setting combinations on the new board yet. I am not sure that it is going to work,ever. Are you still using the same PIC18F2455 because it is possible that it may have been damaged before (not all functionality has to be dead)? Also there is really only one configuratio...

The LED (two actually) on that program should blink if USB is connected and the host is not sleeping. Also I just realized that MCLR was enabled on PIC18F2455 bootloader I attached previously. I am sure other people have had similar problems (I did) but many users here usually have a development kit...

Try programming the attached hex file. It is Microchip HID bootloader created for PIC18F2455 at 8MHz. I programmed it on a PIC18F2550 anyways and it was working fine and my Windows 7 device manager detected it as PIC18F2455 Bootloader. It will let you know if you have a problem in hardware or in sof...

Keep in mind that with PWM you are not actually controlling the voltage, instead you are controlling how long full voltage (12V) is applied and how long no voltage is applied. Since solenoids/inductors/motors take time to charge you can kind of treat the duty cycle as average proportional to the max...

Both of your PWM circuits will work since the IRL530 is a logic level MOSFET. Usually a MOSFET driver is used to speed-up on/off time and also to reduce the on state resistance (reduces power loss in the MOSFET at high currents). Using a MOSFET driver will not make a big difference for your case if ...

If you are using the Bootloader hex file I provided then you do not need an external interrupt because it enables the internal pull-up just before checking RB4. I am not sure why you are getting that error message because I compiled with no problems. Are you using the latest version of mikroBasic (i...

Do not comment out or modify the Vectors procedure because it is used to redirect the Reset, Interrupt and Interrupt_Low functions. Bootloader redirect Reset from 0x0 to 0x1000, Interrupt from 0x8 to 0x1008 and Interrupt_Low from 0x18 to 0x1018. This part of the code has no use unless you are using ...