🇫🇮 Jarno Piironen

NANOHOLD R.E.G.A | ORBIDAR R.E.L.U | PiiDrone X-314 Quad | 3D DESIGNER AND PRODUCT DEVELOPER

[🇫🇮 Jarno Piironen @webronen]

PiiDrone X-314 Quad

GitHub:
https://t.co/QAMGflsv3C

Maker World:
https://t.co/Ipjftudp3M

[🇫🇮 Jarno Piironen @webronen]

@Jorazon1 Small helper robot arm for desktop. 7-axis.

[🇫🇮 Jarno Piironen @webronen]

Guides. Final iterations.

[🇫🇮 Jarno Piironen @webronen]

https://t.co/o31XPFd8rO | Functional 3D Prints

[🇫🇮 Jarno Piironen @webronen]

https://t.co/672BHcxS0s

[🇫🇮 Jarno Piironen @webronen]

UART over a 3.3V power line. No modem IC.

74HC132 — carrier oscillator + all logic
MCP601 — line driver
VS1838B — demodulator
ESP32-S3 — packet handling
CRC-16 + 8O1 error detection

One quad gate. One op-amp. One IR receiver.

Falstad example:
https://t.co/BbeFuCZdPB

[🇫🇮 Jarno Piironen @webronen]

Full-to-half-duplex conversion with RX mute using 74HC132 quad NAND IC.

Four gates, two 220Ω resistors:
- Gates 1+2: buffered TX driver to line
- Gate 3: inverts TXR, feeds Gate 4
- Gate 4: NAND(TX, ~TXR)

Falstad example:
https://t.co/xdnOs3HX52

[🇫🇮 Jarno Piironen @webronen]

@i2cjak Easy to like.

[🇫🇮 Jarno Piironen @webronen]

@i2cjak Easy to like.

[🇫🇮 Jarno Piironen @webronen]

@eevblog Yep. I'm ready. :)

[🇫🇮 Jarno Piironen @webronen]

@Afghan_Engineer HW/FW. :)

[🇫🇮 Jarno Piironen @webronen]

@AlperenAkkuncu Yes, correct. We do not want too much C to "dirty" side, so driver do not fight too much. If more C is needed, driver has to be more powerful. Isolated, clean 3.3V side has own normal locals. 3V3 C is controlled, measured and documented, after testing. Current goal is 10 meters.

[🇫🇮 Jarno Piironen @webronen]

UART over DC is beautiful.

[Tom Fleet @tomfleet]

And now with the uart serial link between the two boards replaced by usb-cdc serial, via the USB Host on the EEP32p4.

There's something very satisfying about connecting your own devices via USB-C, albeit only USB2 Full speed...

[🇫🇮 Jarno Piironen @webronen]

@tomfleet Low power sensor, driver bus..I just make frame, protocol. Power line communication over DC. Also hybrid, can read external IR, because receiver "hack". Next step is to isolate VSS and VDD from "dirty" 3.3V to clean 3.3V for sensitive parts. Dirty breadboard first, after PCB.

[🇫🇮 Jarno Piironen @webronen]

New tool. Replaced A1 and A1 mini.

[🇫🇮 Jarno Piironen @webronen]

POWERLINE U.A.R.T

UART data is modulated onto a 38kHz carrier and injected directly onto a 3.3V power line using two logic ICs and an op-amp line driver.

#Firmware #HardwareHacking #IoT #Innovation
#EmbeddedSystems #LowPowerDesign #Falstad

[🇫🇮 Jarno Piironen @webronen]

@willreil Painted whole board, made cardboard jig and beamed solder points open.

[🇫🇮 Jarno Piironen @webronen]

@willreil I used fibre laser to remove.