Added some oscilloscope measured waveforms to my blogpost about the hc-sr04 ultrasonic distance sensor. Trigger pulse width was off from the expected width on linux. Ultrasonic pulses clearly visual as well
@EmbeddedJourneys
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I love making little machines tick—especially the smaller ones! The smaller they are, the cooler they get.
Expected to create a 10us pulse in python using time.sleep() on my raspberry pi:
GPIO.output(pin_trig, GPIO.HIGH)
time.sleep(10E-6)
GPIO.output(pin_trig, GPIO.LOW)
Only to see a 95.5us pulse with my #siglent scope
Looking to turn my #Pico2 in a rudimentary #oscilloscope. Have been checking the ADC's samplerate and tried measuring an ultrasonic distance sensor's echo pulse. Not quite there yet, USB throughput is still a limiting factor.
https://embeddedjourneys.com/blog/pico-rudimentary-oscilloscope-1/
Correct result came a bit faster then expected! Step response measured through RP2350 ADC from 3V3 to Ground. The transition in between is due to the ADC pin being floating for a brief moment in time #pico2 #embedded
ADC readouts on the #pico2 are coming together. Plot below for the visualization of MSB of the adc output (4 bits). Switching input from 3V3 to GND.
Mental note: adc input 3 (or GPIO29) can not be used to measure custom voltages on the #Pico 2 W board as it is already routed on the board to potentially measure Vsys/3.
Spent some time getting a usb bulk data stream working on a Raspberry Pico 2W using TinyUSB.
Biggest hurdles were device/configuration descriptor and realizing tud_task() needs to be called frequently.
https://embeddedjourneys.com/blog/first-time-usb-data-stream-on-pico/
Nice to see #bluetooth is still innovating, discovered about "bluetooth channel sounding", increased accuracy and security in distance measurement #embedded