$20 LCR ESR Transistor checker project

[GraemeG]

The battery check is usually done about every 10 s when running functions/tools. When the voltage drops below BAT_LOW the display will show the battery status and the tester powers down after 3 seconds. Maybe the interval is too long for a small battery like in the TC1. You can change the interval in main.c, in function CheckBattery():

After testing again I learn I should check everything twice (maybe 3 times!) before posting and showing my ignorance. The battery check is definitely working for me in both the zener and capacitor leakage tests. After the battery voltage drops below BAT_LOW a few seconds later the low voltage is displayed and the unit turns off. Exactly as you described madires. I don't know what I was imaging before 

[Yuriy_K]

Added Rbe measurement for the k-firmware. Modified the Cg calculation for the Arduino Mega.

I found a bug when measuring resistance, so I replaced everything...

[Yuriy_K]

An option for measuring the external frequency of both quartz and ceramic resonators using T-testers with an ST7735 instead of an Xtal.
For slower models, the above addition is required. I have a similar solution working on a T4 with an ST7565, but I can't test it with the ILI9341 I have because I don't have enough memory. Anyone willing to take the risk and check?

The range I tested was from 32768 Hz to 48.0 MHz, the measured external frequency was 70 Hz to 70 MHz.

I found a bug when measuring resistance, so I replaced everything...

Added a BGR option, check it out for yourself...
If you don't need a frequency higher than 25 MHz, you can use an HCF4060BE. It's powered by 9V, and the output is divided by a 10 k resistors.

[sv1dpp]

Hi, I need to replace an LGT8FX8P in 32 pin version with an ATMEGA328p 32 pin version also. Could you please informe if the two chips have identical pins and more information about firmware. Many thank

[CaptainBucko]

Hi, I need to replace an LGT8FX8P in 32 pin version with an ATMEGA328p 32 pin version also. Could you please informe if the two chips have identical pins and more information about firmware. Many thank

This post has the info you need (depends exactly on your unit) https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/msg5895940/#msg5895940