2nd Chance PI

[dantech]

v020 is released

[dantech]

7. Should be SPI not ISP

[dantech]

1. Remove all ICs
2. Check power supply lines +5V, +12V, -12V. Power consumption should be circa 30mA
3. Check shortcuts on PCB near ATmega328
4. Verify Atmega328 fuse bits and flash memory content
5. Put ICs back
6. Check oscillogram on crystal pins
7. Check signals on ISP bus (eg. clock signal for ADC)
8. Check LCD connections
9. Check LCD contrast resistor

[ripsdevala]

My board not work, just blank lcd, no sound, anyone have voltage reading?

[ripsdevala]

should be okay

Ok, i will continue then, many thanks

[dantech]

should be okay

[ripsdevala]

Is this winding ok? Have gap like this?

[dantech]

v019 is released.
Anti-commercial lock changed. After first 100 runs there is no permanent lock but it is necessary to wait additional 300s or reflash cpu again

[dantech]

Firmware v018 is released
Now it is possible to change main pulse width in the range 50-200us to fit pulse width and saturate properly the coils with different speeds and sizes (eg. very small basket coils and large frame coils).
"Restore to default" feature is moved into menu.

[dantech]

No, I do not have any picture inside. The detector is completed and closed in the box

[ripsdevala]

Any problem, any progress?

Good morning all,
Not yet, i like to get 0.8mm wire instead, for stock , btw i dont know what diode should be place on the keyboard D1 - D4, or its just 4148
Do you have pic top of your pcb, i like to make sure all is already on place.

[CDI]

I did not try bigger coil but in theory it should work well.
Every process parameter can be customized in the menu in the very wide range so I do not see technical problems to use "frame coil". Of course you have to wind it by thick wire. to keep low resistance as possible and to keep inductance 300-400uH. The coil should be simply fast because pulse width is 120us and the coil should be able to saturate in this time
I saw the poeple has made frame coils for classic ChancePI

Thank's dantech, i will try 50 cm coil or less... but now i'm waiting for pcb and parts.

[dantech]

I did not try bigger coil but in theory it should work well.
Every process parameter can be customized in the menu in the very wide range so I do not see technical problems to use "frame coil". Of course you have to wind it by thick wire. to keep low resistance as possible and to keep inductance 300-400uH. The coil should be simply fast because pulse width is 120us and the coil should be able to saturate in this time
I saw the poeple has made frame coils for classic ChancePI

[CDI]

Hi dantech, did u ever tried bigger coil than this in your description? If so, which result u got? I'm not interested for small gold, so i can use bigger coil.

[dantech]

Any problem, any progress?