My point was that, if anyone were to offer a pre-assembled device with a simple repository of builds (actually, just one or two), it would go a long way towards solving the problem.
The real problem, as others are pointing out, is that any decent quality kit, once the cost of the better components, assembly and shipping are taken into account, would be too expensive for most users (or has to be sold at cost, making it a bad proposition for whoever assembles it)
Can I add a rottary switch button to this model GM328B ? Where I can solder this ?
or else can I add 3 more buttons for using them for scrolling up down and for back ?
I think I found some of the answers through Karls doc:
this schematic is explaining much. The only thing I dont know yet is if I can use both rotary and buttons through software issues.
I bought 2 of the attached tester and installed the M version on one and the K version on the other. The one with the K version burnt the chip (v05 - diode array) and then the main chip. Should I be modifying it to use the K version? Also, with the M version, if there is nothing in the tester it gives me a reading of a capacitor of 15 pf, but seems to work ok otherwise.
I use one of the surface-mount test pads to discharge caps on the AY-AT. They're a handy bit of metal near the ZIF socket. Of course be careful to hit only ONE of the pads with both legs of the cap, or POOF! goes your tester. Several other boards have something similar you can use.
I discharge all caps (regardless of type or 'built-in protection' on the board) as I've seen a number of folks complain that they've fried their tester. My ATmega is socketed, but I don't have an endless supply of them.
How is the pad on the board any more better than the metal arm of the contact-array thingy?
The ideal solution is to purchase or build a simple device with proper current protection using a series of diodes and two LEDs. So, you will be able to see visually when the capacitor is discharged enough to be handled safely.
My quick and dirty slightly overkill capacitor discharger arrangement, using bunch of resistors, couple screw terminal thingies and two leads I happened to have available.
The chip said it had been programmed, but the device did not understand anything, and continued to turn on the display and show the signal of the cell and the message "cell 53mV"
My quick and dirty slightly overkill capacitor discharger arrangement, using bunch of resistors, couple screw terminal thingies and two leads I happened to have available.
The chip said it had been programmed, but the device did not understand anything, and continued to turn on the display and show the signal of the cell and the message "cell 53mV"
Some manufacturers set the lock bits and you have to erase the complete ATmega to be able to program a new firmware. The "cell" message is displayed when the tester detects a voltage at one of the probe pins. It can be caused by a fried MCU pin or some leakage current (PCB, ZIF socket, etc.).
I 've post here because it looks like my own problem.
I 've post here because it looks like my own problem.
Have the exact same tester and very similar problems to what you are experiencing. Turned out the main chip was damaged, so I changed it and got the tester to run perfectly again..it's been almost over a year, and it's still going strong.
In retrospect, I started thinking why was the main chip damaged, and I remember doing some in circuit ESR testing and at some point something felt weird when checking a capacitor and bang that was it, it was charged and damaged the Atmega328P of my unit.