About andrewg

andrewg · 2022-10-15

hi various SOCs in STM32 family e.g. stm32f407ve, and many in the F7, H7 series features a "USB 2.0 high-speed/full-speed device/host/OTG controller with dedicated DMA, on-chip full-speed PHY and ULPI"But your STULPI01 is a μTFBGA36 package. https://...

andrewg · 2021-09-20

I've been messing around with a LMT86 temperature sensorThis sensor is deemed high output impedance as the documented loads it drives is 50uA.ADC noise on STM32 isn't 'new'. Just that for a first time I'm observing such volatility up close. The probl...

andrewg · 2021-09-06

I've seen the discussion in an old question herehttps://community.st.com/s/question/0D50X00009XkbAd/how-to-protect-analog-inputs-Accordingly, ADC inputs are not 5v tolerant in ADC mode.I started studying some Zener diodes, in particular 1n4727 Vz 3vh...

andrewg · 2020-07-01

i'm thinking about interfacing DHT11 or DHT22 (AM2302) https://www.mouser.com/datasheet/2/758/DHT11-Technical-Data-Sheet-Translated-Version-1143054.pdfhttps://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdfa thing i noted about both of them...

andrewg · 2019-03-10

hi i'm reviewing rm0008 ref manual for stm32f103 the adc.accordingly, adc clock max is 14mhz and it takes 14 adc clock cycles for 1 conversion - hence 1msps per ADC.however, from the RCC section the available prescalers are 2, 4, 6, 8and if we take 7...

andrewg · 2021-09-23

There is a solution though kind of, there are these 64 Mb (8 MB) SPI PS RAMhttps://www.aliexpress.com/item/1005001922515989.htmlhttps://www.aliexpress.com/item/1005001839058261.htmlhttps://www.aliexpress.com/item/4001237378912.htmlhttps://www.aliexpr...

andrewg · 2021-09-22

And one more round of checks on the 'scope' graphs. LMT86 patched directly on the breadboard - no long wires / no cords / no op amps etc.10k samples per sec STM32F401 ADC PA0 100k samples per sec500k samples per sec There are still some visible art...

andrewg · 2021-09-22

Here is an update, I patched a LMT86 directly on the breadboard - no long wires / no cords / no op amps etc.2000 samples, LMT86 direct to STM32F401 ADC PA0 LMT86 direct to STM32F401 ADC PA0 discarding 122 values outside 0.5 deg C range from median, t...

andrewg · 2021-09-22

Thanks @Georgy Moshkin, the 'scope' graphs is a little app I created on stm32f401 that capture ADC samples from PA0 ADC1. It records 1200 samples in a buffer at a time using DMA and send them (the buffer) across after the capture. Capture is initiat...

andrewg · 2021-09-21

The above 'scope' charts seem to suggest why, apparently, that 'median' filtering seemed to work. The sensor voltages is concentrated in a narrow band.I'd continue to work the tests to see if those (noise/spikes) could be identified to particular sou...

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product request: STULPI01 LQFP package?

ADC noise on stm32f401

how to protect analog inputs ?

built in pull up resistor

stm32f103 14mhz adc clock and prescalers only allow 12mhz?

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Re: ADC noise on stm32f401

Re: ADC noise on stm32f401

Re: ADC noise on stm32f401