$20 LCR ESR Transistor checker project

[madires]

You could try following:

In display.c, function Display_Value() change

Code: [Select]

    if (Offset > 0)                     /* dot required */
to

Code: [Select]

    /* dot required or 4-digit value */
    if ((Offset > 0) || (Value >= 1000))

Edit: Will be an option in the next firmware version.

[Kim Christensen]

At first, I tried something similar to your solution madires. But found that some calls to Display_Value() returned unwanted results. One I remember was the self tests and corrections mV readouts being in volts.
So in the end, I wrote my code so it only changed the default behavior for certain calls to Display_Value(). I'm sure there's a more elegant way than my solution.

[madires]

The only value looking a bit strange should be T6 (Rh+) in the self test. It's near Vcc, e.g. 4990. 4990 would become 4.980k (because it's just a plain number).

@all: Please tell me if you encounter other strange values when testing the modification for 4-digit values!

[edgard22]

Thanks, I haven't tested it thoroughly but everything seems to be ok.

Gracias, no he probado a fondo pero parece estar todo ok.

[Feliciano]

The only value looking a bit strange should be T6 (Rh+) in the self test. It's near Vcc, e.g. 4990. 4990 would become 4.980k (because it's just a plain number).

@all: Please tell me if you encounter other strange values when testing the modification for 4-digit values!

For normal and ESR capacitor measurements, the new dot option works for me.
Indeed the more noticeable "strange" results are in the SelfTest: I don't mind T1 showing 1.1xxV, but T6 showing 4.9xxK(mV) can be confusing. I think that part would require a little adjustment too

[madires]

Also, three times 4.9xxk plus two spaces exceeds a line length of 16 chars. The new firmware version will come with a simple workaround when 4-digit values are disabled.

[indman]

madires, there is a suggestion to implement the possibility to disable the "Selftest" option in the firmware? This will save some memory, as this procedure is usually done only a few times when hardware problems are detected. Now I disable this option myself if I compile the firmware for myself. If I am sure that my circuit is correct, I only need the "Self Adjustment"option. If any strange results appear, you can always enable self-test if necessary or use the standard firmware where this option is enabled.

[madires]

Ok, I'll add that to the to-do list.

[madires]

Disabling the self-test reduces the firmware size by about 86 bytes (and a few bytes in the EEPROM). I also replaced a few similar function calls of Display_Value() with a new convenience function, freeing up another 50 bytes.

[madires]

Bohu has updated the PDFs (for firmware 1.52m, Czech, English and German): https://github.com/madires/Transistortester-Warehouse/tree/master/Documentation