Gareth's blog

STM32F103 C8T6 PWM Timer and NE555 redundancy Part 002

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Latest iteration of the Neon supply 170 - 240 Volt generator.

The original circuit sported a "NE555" to drive the "Fly-Back" inductor N-Channel MOSFET, then after a hour sitting in its cosy socket (and an elvish brainwave later) it has been made redundant in preference to some"PWM Code..."


STM32F103 C8T6 3.3V meets 170Volt Neons. ... Part 001

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Over the last few months these "Coloured Neon lamp indicators" have been popping up on the matrix, so I could not resit...well who could not resist mixing 3.3volt logic with 170volt.

They come in a variety of colours "Green","Blue" and "Orange" , the glow intensity is good even in daylight.


Taking the "Blue-Pill" aka STM32F103 C8T6 ... Part 000

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The MCU you see above is know as the "Blue-Pill" , it belongs to the STM32 family.

To put it in simple terms.... its a bit like an Arduino on steroids.

STM32F103 Specs :-


nRF52840 Nordic Semiconductor (Part 003) Flash Memory Migration from nRF52832

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There are two common nRF "Mini" development boards available namely :-


nRF52840 Nordic Semiconductor (Part 002) - GPIO Inputs

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Based off the Bog standard "Blinky "Example contained in the NRF SDK :- C:\nRF5_SDK_17.0.2_d674dde\examples\peripheral\blinky\pca10059\mbr\ses\blinky_pca10059_mbr.emProject


nRF52840 Nordic Semiconductor (Part 001) - GPIO Outputs

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Based off the Bog standard "Blinky "Example contained in the NRF SDK :- C:\nRF5_SDK_17.0.2_d674dde\examples\peripheral\blinky\pca10059\mbr\ses\blinky_pca10059_mbr.emProject


Bird Base Alpha - ESP32 Birdy Cam OpenCV Motion Detect filter

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Birdy Cam is getting ready for the Winter...

This is an ESP32 Cam being fed into MRL's OpenCV service, streaming Mpeg with URL (plus Motion Detect Filter).

If you have an ESP32 Cam then it is HIGHLY recommended to install a good antenna (see below).

For point of cost reference ESP32Cam is circa $6 (one bag of sunflower seeds also circa $6).


Telegram Bot (MRLbot experimentations)

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Experimentation's with a TelegramBot polling an ESP32.

These Bots can be found or created via the Telegram App Messaging service...

(in our case I have called it "MRLbot" )

MRLbot & ESP32 Marriage possibilities :-


"Peri-Scope up" - FNIRSI-1013D Portable Oscilloscope 100Mhz(!!)

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I just bought one of these, thought I would bring to your attention :-

Best part ..... its circa 120$ delivered including two x1/x10 probes ..

(-: bonus for me was that the customs elves were on coffee break :-)

In a nut shell its a Dual channel 100Mhz with 7" colour touch screen.

The performance drops off the more you lean over 80Mhz. (100Mhz is bit tongue in cheek, however how often do we need to measure so high)