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Hi, Geoff Looks like the MCU FW is protected to be read. You have to erase it and configure simple ATU100 FW before upload it . It has a price, but it is bigger OLED you can use

I think I've discovered a tuning bug. For some of my test points, a relay_set of -128 will occur. During the fine tuning, a char overflows at the start of a for loop in the code below. My current

I've used 74HC595 for LED displays (driving ULN2003s).? I've wondered about these, and given the low switching frequency, it's an option. By moving the pins around (and using the MCLR for the tune

1. Yes, I want to add

Frequency status: I've looked at a few RF frequency detector designs, and have worked out a prototype (aka Mark I). It uses a 74AHC14 Schmitt trigger inverter (good to 125MHz) on the front end with a

on your point four Roger, how about a couple of I2C parallel ports or shift registers on the RF deck to drive the relays, a significant reduction is connections between boards...

1) Moving the code to the RP2040 from the Raspberry Pi foundation. This would make it easy to add a WiFi interface for remote control and display. The RP2040 is not very expensive, $4 without and $6

Hi Roger, I think all of the additional features and suggestions from others are perfectly valid. From an operational side of things, the ATU-10 features such as latching relays and updating via USB

During the full capacitor and inductor searching, the current code uses straight binary values (with a change in step for the higher values). So the smallest capacitor relay does a lot of

Starting from scratch would have been a lot of work, but adding frequency measurement doesn't look too bad, and the rest if software!

I also can't figure how Gray codes would be used. That's quite a bit of work you've outlined Roger!!!! I'll add the things I've been thinking about. 1) Moving the code to the RP2040 from the

Finished the test code and checked it in at https://github.com/tomcourt/tunetest I'd tried to port it to Visual Studio, no complex data time so I tried to roll my own. Way too slow. So I ported it to

I have researched about Gray code, looks like it is impossible to use in tuners, because 0 and 1 both have value depending on position.

I can't help you with the repair. But I was wondering where you purchased the unit.? Did you buy the kit, or a complete unit somewhere else.

Hi, Just joined the group. I got a N7DDC ATU-1000 from Aliexpress, and have successfully built it. There appears to be plenty of info on the ATU-100,., but little on the 1000. There are a couple of

Hello Roger, Sounds like a great list of enhancements/ changes. Just want to make sure, that I interpret your changes correctly: 1. Remote display / control - required to free up enough pins for the

Hello, Paul Why you didn't read the schematic of this tuner ? Why I spent my time to create that ?

you could even use 1N4004 if you really wanted to

Hi, Roger. Looks like you wanna build your own better tuner? . Good luck. Interested.

Looking at the data sheets, https://www.st.com/resource/en/datasheet/bat41.pdf If=200mA, Ctyp=3pF and https://www.st.com/resource/en/datasheet/1n5711.pdf If=15mA, Ctyp=2pF I would be worried about