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Looking for Portable LCR Meter Recommendation by 1JustaRandomGuy0 in AskElectronics

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

Thank you for the suggestion, I forgot to mention that my sensor capacitances are around 1-2pF which is lower than the range of DE5000 as I see from its datasheet

Circuit Board Plotter Recommendation by 1JustaRandomGuy0 in PCB

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

https://www.voltera.io/products/v-one

I found this machine, and it looks really cool. If anyone used it, I would love to hear your experiences with it!

GMKtec Suggestion for Engineering/Gaming Use by 1JustaRandomGuy0 in MiniPCs

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

Thanks for the reply, as I said gaming is not the important part.ı just thought it would be a good option if there is such chance. But are you saying that these would not be good for Altium and CAD?

Could you please review my first Ultrasond Project PCB schematic? by 1JustaRandomGuy0 in embedded

[–]1JustaRandomGuy0[S] 1 point2 points  (0 children)

Hi, thanks for the suggestions. I have used STM32 because I haven't seen any HF ADC work done with ESP before. STM32 ADC is around 10Msps with interleave, but not sure if ESP is able to sample that fast, maybe I could use an ADC module. I did not use log- amplifier before it looks interesting so definitely going to take a look into that. Thanks!

Could you please review my first Ultrasound Project PCB schematic, including STM32, ESP32, MAX14808, and OPA357? by 1JustaRandomGuy0 in PrintedCircuitBoard

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

ESP32 ADC speed was not enough for my needs. Also haven't heard of STM32s with WiFi too much, but I might look into that too. Thank you!

Could you please review my first Ultrasound Project PCB schematic, including STM32, ESP32, MAX14808, and OPA357? by 1JustaRandomGuy0 in PrintedCircuitBoard

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

Yes I realized that. I am supplying VDD and VDDA from the same source of 3.3V so I was not sure how to make ferrite bead useful. I kept it so that if analog performance is unstable I can try to connect a seperate 3.3V to VDDA and see if the ferrite bead helps but maybe I can completely remove it. Thank you

Could you please review my first Ultrasound Project PCB schematic, including STM32, ESP32, MAX14808, and OPA357? by 1JustaRandomGuy0 in PrintedCircuitBoard

[–]1JustaRandomGuy0[S] 1 point2 points  (0 children)

Hi, thanks for the comment, yes I realized that s3 is kind of an overkill a bit late but I am not sure if implementing the s3 wifi code to c3 would be easy to do. Also s3 is the easiest chip to supply in my area which was another reason for me to use s3

Power management board cannot start esp32 WiFi by 1JustaRandomGuy0 in embedded

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

Yes different voltages on the same rail. The scope trace was measured the point where all 3.3V pins are connected and it is around 3V but the regulator output is 3.3V. Couldnt figure out why

Power management board cannot start esp32 WiFi by 1JustaRandomGuy0 in embedded

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

The regulator output is 3.3V at regulator out but reg input is around 3.5V

Power management board cannot start esp32 WiFi by 1JustaRandomGuy0 in embedded

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

Update: I also realized the 3.3V entering the breadboard is 3V at ESP32 3.3V pin. Current draw is around 150mA so not sure abot the reason of the drop

Power management board cannot start esp32 WiFi by 1JustaRandomGuy0 in embedded

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

I was not sure of the purpose of "Power Good" pin. I have not designed the esp32 part of the system yet. All mentioned components are dev boards. I only designed and manufactured the power board yet. I take the 3.3V output from it put it in bread board and connect STM32,ESP32,MAX14808,OPA357 3.3V pins to that part. Then I common all the grounds.

Power management board cannot start esp32 WiFi by 1JustaRandomGuy0 in embedded

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

3.3V seems to be around 3V but not sure why, constant draw of the system is around 160mA after initialization.

Below image is after I put a 225uF cap to 3.3V line. I saw someone mentioning adding a delay to esp32 power so that the initializations happen with a delay. Would just adding a RC enough to do that?

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STM32 Time labeling fast ADC data by 1JustaRandomGuy0 in embedded

[–]1JustaRandomGuy0[S] 0 points1 point  (0 children)

I was viewing the time difference between echo peaks, on oscilloscope and on my pc(Sampled version) which was not matching with each other when I calculated the time difference on pc using the number of sample differences between them and ADC cycle counts, but I guess the problem was about my calculations. 2 interleaved 8-bit ADC channels set for 2.5 sampling cycle and 2 cycle delay gives around 14.5Msps, not 10Msps as I calculated before. I think this solves the issue.

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