GM328 transistor tester MCU firmware update - Page 1
Forum section: electronics / testgear

author: sdancer75
author_rank: Frequent Contributor
timestamp: March 17, 2019, 08:23:59 am
content: Hi,I bought a GM328 transistor tester that can't be calibrated. It stucks at the "short probes" stage. Anyway, I decided to update the MCU firmware.I connected the ATMega328pu to my breadboard and I double checked the connections with my DMM. The AVRdude always return the following error :D:\temp\GM328\EN>avrdude -pm328p -cUSBasp -B4 -Pusbavrdude: set SCK frequency to 187500 Hzavrdude: warning: cannot set sck period. please check for usbasp firmware update.avrdude: error: programm enable: target doesn't answer. 1avrdude: initialization failed, rc=-1Double check connections and try again, or use -F to overridethis check.avrdude done. Thank you.I even tried to connect an external crystal but without luck. What seems to be wrong here? My OS is Win10/64Bit and AVRdude is v5.10Regards,

author: sdancer75
author_rank: Frequent Contributor
timestamp: March 17, 2019, 10:51:14 am
content: An 8MHZ crystal solved the problem !!!Best Regards,

author: sdancer75
author_rank: Frequent Contributor
timestamp: April 15, 2019, 05:12:00 pm
content: Also to note, the GM328 could not be calibrated because it had wrong resistors. I replaced them, and it worked like a charm.

author: akcoord
author_rank: Newbie
timestamp: November 29, 2022, 02:05:20 pm
content: could you plzmention the steps to do that and explain how to update and pass the fuse thing i have mine and i want to update using the usbasp but do not know which software to use and how tobest regardsi hope you still follow

author: Fuzzy Star
author_rank: Contributor
timestamp: November 30, 2022, 03:30:35 pm
content: Quote from: akcoord on November 29, 2022, 02:05:20 pmThe info that you are looking for is probably in this thread:https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/You can do search there.

author: akcoord
author_rank: Newbie
timestamp: December 01, 2022, 11:14:38 am
content: thanks mani hoped for a full steps buy video guide anyway thanks mine is mg328 and i face the same problem with soft 1.11k which is very old also selftest message always appear even if i calibrate it so many timeand the resistors value you mention is the right one but they need a very precise onei hoped for tools for compiling the download version of v m1.45 and tools to use to extract makefile and hex and eep one also how to change fuses to suite my hardwre version which is not present at the hole 3700 postbest regards

author: pope
author_rank: Frequent Contributor
timestamp: December 01, 2022, 12:38:32 pm
content: Same here,That thread is so overwhelming... Every time I try to read something, I give up after 5 minutes.

author: sdancer75
author_rank: Frequent Contributor
timestamp: December 01, 2022, 12:57:05 pm
content: Hi,I really don't remember anything of this. It was quite long now.Anyway, I am not a professional electronic technician but instead, a software developer so it's not my everyday work. This is a hobby for me, working with electronics and microcontrollers.As far as I can see from the photos I attached, I followed the connection diagram, and using avrdude I uploaded the new firmware.Where exactly do you have a problem with this? Are you able to use AVRDude? What is your experience on the topic?Regards,