CH32F103/FNIRSI: Success!

 Still some minor tweaks to apply, but it works 



Comments

  1. AgungDecember 16, 2022 at 6:42 PM

    fnirsi is using ch32, after comparing with jyetech's dso150 pcb I found only a few resistors not installed, can I replace it with gd32f303 and add some missing resistors so it can be used like jyetech's pcb?

    ReplyDelete
  2. meanXDecember 16, 2022 at 10:15 PM

    There are some minor differences also in the way the AC/DC button switch is wired and some buttons wiring. You can use a lnDSO150 firmware with fnirsi pcb + gd32f103 , it must be built with that combo. (The official jyetech or fnirsi fw will not work). If you need it, please open a ticket on github, i'll attach the corresponding fw

    ReplyDelete
  3. AgungDecember 17, 2022 at 3:13 AM

    thank you sir, I will try the fnirsi pcb with gd32f103 first,, because I really like lnDSO150 since it was first released,

    ReplyDelete

Post a Comment

Popular posts from this blog

G600 Microscope Battery charging mod

Image
While thinking about replacing the mini usb connector to a micro one on my G600 microscope , i've  seen that   post  from Syonyk. Damn ! No real battery charging, straight to 5v. Warning : This is not an accurate analysis, it may contain errors or missing /misunderstood parts. Let's have a look. The partially reverse engineered/ contains error schematic /picture is as follows : The equivalent schematic is ( incomplete/may contain error ) : So indeed, VBUS (5v) is connected directly to VBAT through just a schottky (K14) and R12. On the other hand, the BMS circuit is tuned very low and will stop the charge at exactly 4.2 v. My battery is still healthy and only slightly puffy :) Let's use a real charging circuit and remove component so that VBUS is completely isolated from VBAT. Remove K14, the P-Mosfet (Q1) and R54 so that they are really isolated and there is no  resistor between VBUS and ground (R54). I also removed a very small ...
Read more

Component tester with STM32 : Part 1 ADC, Resistor

Image
I was always  fascinated by the so call "transistor testers" that identify and report pin out, features of pretty much whatever you throw at it. They are based on Atmel 328p chip, the same as arduino nano. So why not do the same thing with a STM32/Bluepill ? The STM32 is faster, has a better ADC accuracy, more memory, can do float etc... and is not more expensive. Warning : I'm doing this for fun & to learn, it might contain error & plain misunderstanding So, i watched a couple of video on the general principle on how they work. This is not a "port" but a rewrite from ~ scratch. When something is weird, i check what the original one does for comparison. Measuring resistance So first thing first :  Resistance & Capacitance. These 2 will unlock the other ones. So how do we measure resistance ? What we do is a resistor divider with a know resistance value: Measure = Vcc*(RtoTest/(RtoTest+Rknown)) As far as the ADC goes, it means ADC=...
Read more

Fixing the INA3221

Image
It 's not too complicated to change the board we have seen  previously . You 'll need to cut some tracks, i did it with a dremel and i'm not very handy, so you'll do better. Red =Cut tracks Blue = Add wire 1- You'll need to separate the bottom connector from the ground, cut the 3 connectors BOTH SIDES. 2- Remove the small red area below the middle resistor to isolate each channels from each other Last, connect right side of each connector to the now isolated pad. Mine looks like this after the operation (ugly i know): Be wary of the small track on the left connector that leads to the left side of channel3 resistor. I cut it while isolating the right pad. Now it works, we can go back to the charger.
Read more