Replies to Minipulse Plus

[josewashere]

Good job! Is the chipkit just controlling the detectors timing or this there more to it. I'm interested in the GB if it can be done without loss of sensitivity. sent same question on YT

[CAS]

I only had an hour or so spare so at the moment its only doing tx pulse and the sample gate pulses. If I get time tomorrow I will add a couple of pots to some analog input pins so I can vary the sample delay and width.

I actually want to do some test sampling of the signal out of the preamp. Using the 10 bit ADC I want to take maybe 5 - 10 samples (about 2us apart) within each main sample and just get some data with different target materials so i can get some real world comparisons. Not sure if I would ever use the data but its fun to experiment.

I have ordered a STM32F411E discovery board - has 12 bit ADC, up to 108Mhz clock plus built in audio DAC which I will probably use in my other project but the data I get with the ChipKit and MPP will let me know if I am going in the right direction.

[josewashere]

OK Excellent I look forward to seeing the results

[scrungy_doolittle]

I only had an hour or so spare so at the moment its only doing tx pulse and the sample gate pulses. If I get time tomorrow I will add a couple of pots to some analog input pins so I can vary the sample delay and width.

I actually want to do some test sampling of the signal out of the preamp. Using the 10 bit ADC I want to take maybe 5 - 10 samples (about 2us apart) within each main sample and just get some data with different target materials so i can get some real world comparisons. Not sure if I would ever use the data but its fun to experiment.

I have ordered a STM32F411E discovery board - has 12 bit ADC, up to 108Mhz clock plus built in audio DAC which I will probably use in my other project but the data I get with the ChipKit and MPP will let me know if I am going in the right direction.

I'm working on a STM32F411RE nucleo board 10.33 spec says 100 mhz. but if you want to use USB you have to either go to 96 or over 100

[CAS]

I am not sure I want to use the USB. Maybe hook up a BT module or WiFi module if I want to log data but that would be it. What IDE are you using to program it?

[CAS]

Here is a photo of my latest experiments with MPP all in a case ready to take into the field for testing.

Has a rotary encoder to select different timing / sample experiments as well as small OLED to display various settings. I have set the case up so that I have options for the future.

[Davor]

Nice. Can you measure how much juice goes to chipkit?

[6666]

Nice thanks for showing us Cas

[Chet]

Here is a photo of my latest experiments with MPP all in a case ready to take into the field for testing.

Has a rotary encoder to select different timing / sample experiments as well as small OLED to display various settings. I have set the case up so that I have options for the future.

[ATTACH]32483[/ATTACH]

Hi CAS

Nice job. Let us know how well it works. I have a MPP and a ChipKit and would like to do a similar experiment. Did you program it with the MPIDE or the MPLAB IDE software? So far I have got an OLED programmed and working but haven't started on the pulses and sampling.

Have a great day,
Chet

[CAS]

Hi CAS

Nice job. Let us know how well it works. I have a MPP and a ChipKit and would like to do a similar experiment. Did you program it with the MPIDE or the MPLAB IDE software? So far I have got an OLED programmed and working but haven't started on the pulses and sampling.

Have a great day,
Chet

A am just using the MPIDE. Its quick and easy. Adapting the Chipkit is pretty simple. I use a high speed isolator to control the sample gates and a high speed opto (due to the voltage gnd issues) to supply the pulses to the TX Fet and charge pump sync.

I was experimenting this afternoon and found that using the timings based on the ratios Davor gave me, along with alternating main sample widths, I was able to increase the audio threshold a little and gain about 15 mm extra depth in air on my small 5mm x 5 mm aluminum test sample.

[Chet]

Hi CAS

Thank you for the prompt reply. Looks like you are having good test results.

I agree the MPIDE works well. I have been altering some of the sample programs trying to learn the C programming language. And copying some of the software routines to eventually control the MPP or a universal controller that can be adapted to other detectors.

Regards,
Chet

[scrungy_doolittle]

Here is a photo of my latest experiments with MPP all in a case ready to take into the field for testing.

Has a rotary encoder to select different timing / sample experiments as well as small OLED to display various settings. I have set the case up so that I have options for the future.

[ATTACH]32483[/ATTACH]

Trying to get openstm32 configured to develop on it, but have had little luck. Can get a compile now, but no joy on downloading. Tried mbed (no debugging), coocox doesn't support it, emblocks, builds empty file.


It has been a real struggle.

[CAS]

Trying to get openstm32 configured to develop on it, but have had little luck. Can get a compile now, but no joy on downloading. Tried mbed (no debugging), coocox doesn't support it, emblocks, builds empty file.


It has been a real struggle.

Have you tried Keil uVision - MDK-ARM? There is a lite version you can download for free. Only allows 32kb but does support the Nucleo 411. Can always get full version to get more than the 32kb if it works. I think that I should have looked at what boards have supported IDE's first rather than just look at specs of board. The 411 is a little limited when it comes to supported programming tools but has great specs.

[sinclairuser]

hi all, getting close to finishing i'll post some pics tomorrow, gone well so far even when you know what's what the build plan is fantastic(thanks george).
when i'm done completely do i just send photos to you george via pm?, then you can put them in the completed thread, but i'd like it in its enclosure when you do that.

[Qiaozhi]

hi all, getting close to finishing i'll post some pics tomorrow, gone well so far even when you know what's what the build plan is fantastic(thanks george).
when i'm done completely do i just send photos to you george via pm?, then you can put them in the completed thread, but i'd like it in its enclosure when you do that.

Yes please. Send the photos to me, together with any comments, and I'll add you to the Hall of Fame.