Guim P.

@guimpt.bsky.social

91 Followers 80 Following

Passionate about everything related to electronics and robotics. Electronics freelancer when the sun rises and hobbyist when the sun falls.

Complete PCB layout of the "reixa v1.0" gate-remote board. Four tactile-button footprints sit in a 2 by 2 grid on the upper half. The lower half is the RF section: a LoRa module, a smaller transceiver IC, and a crystal, with copper traces routing between them. A zig-zag trace along the bottom edge is the 868 MHz antenna; a copper track around the board perimeter is the 433 MHz loop antenna.
3D render of a small PCB for a gate remote. Top half has four round tactile buttons. Bottom half holds the RF section.
The R45 PCB Motor performing a couple of revolutions every few seconds.
R45 PCB Motor Driver mounted on the backside of the R45 PCB Motor.
PCBs for the R45 PCB Motor Driver plus some other gifts that came in the box.
Square green PCB. The board integrates an onboard magnetic encoder, phase drivers, current sensing, built-in protections, and CAN communication.
Blender render of the R45 PCB Motor Driver PCB, a BLDC motor driver specifically designed to be used with the R45 PCB Motor.
Almost completely routed 4-layer PCB (all ground planes are shelved). Different colors show different net classes.
Render of the R45 PCB Motor with the motor driver (work in progress) on top, with the phases connectors aligned.
Video of the first closed-loop position control tests with the R45 PCB Motor.
Oscilloscope screenshot showing a clean sinusoidal waveform from a test of the R45 PCB motor stack.
Thermal image of 4 stacked R45 PCB Motors. A temperature increase of 55ºC from ambient can be observed.
R45 PCB Motor accelerating with Field Oriented Control.
Graph showing the error between current axis and encoder reading.
Oscilloscope capture showing the sinusoidal line-to-line back-emf of the R45 PCB Motor while spinning.
Thermal test results when 3 A are flowing through a single PCB of the R45 PCB Motor. The maximum reached temperatures are near 90 ºC.
Video showing the R45 PCB motor spinning in open loop mode.
3D-printed rotor fully loaded with glued rectangular magnets in a Halbach configuration. A magnetic viewing film is partially laid over the magnets and shows that there is a north pole and a south pole every two magnets, instead of every single magnet as in a typical magnet arrangement.
3D-printed rotor with rectangular neodymium magnets partially inserted into radial slots. The magnets alternate in orientation, forming a Halbach array. Some magnets are slightly lifted due to magnetic repulsion, highlighting the difficulty of assembly.
3D-printed rotor for the R45 PCB Motor, with 40 slots arranged radially for magnet placement. Below the rotor, 40 rectangular neodymium magnets are lined up, each marked with a white dot to indicate polarity.
Spreadsheet showing various stackup options from JLCPCB and PCBWay, prices and copper percentages.
FEMM simulation showing the magnetic field lines and flux density of the Halbach magnet array used in the R45 PCB Motor.
Round green PCBs stacked. The phases of the motors can be appreciated.
Thermal image of the Comb PCB Motor during testing with 1.6 A of current. The copper windings on the PCB appear hot, with the highest recorded temperature shown as 98.4 °C.
3D-printed rectangular case in light gray, housing the IoT HDMI mux.
Side view of the Comb PCB Motor, the new bearing holder is much taller than before.
A Bambu Lab A1 3D printer with a freshly printed rotor for the Comb PCB Motor on its print bed.
CAD view of the next revision of the Comb PCB Motor.
Close-up of the IoT HDMI Mux PCB with three HDMI ports connected.
Video of the Comb PCB Motor performing closed-loop position control, rotating to various angles. An overlaid plot shows target vs actual position.
Mostly square PCB with some ICs and parts, a USB C connector, a PCB antenna and three HDMI connectors.
The Comb PCB Motor spinning at varying speeds under closed-loop control. A plot displays both the target speed and the actual speed of the motor.
Oscilloscope screenshot showing the differential voltage between two phases of the Comb PCB Motor during free spin. The waveform is a trapezoidal back-EMF signal with a peak-to-peak amplitude of ~900 mV and a period of ~10.3 ms, used to estimate the motor’s Kv.
Oscilloscope screenshot showing a decaying sinusoidal waveform used to measure the inductance of the Comb PCB Motor. The waveform indicates a resonant frequency of 250.89 kHz, from which the phase inductance is calculated to be approximately 2 µH.
Video of the Comb PCB Motor spinning smoothly from zero speed.
Close-up of the Comb PCB Motor showing a rework.
Simulation plot showing torque vs angle for the Comb PCB Motor (ideally the line should be as flat as possible).
A test setup measuring the phase resistance of the Comb PCB Motor. A digital power supply is pumping 1 A to two motor phases, while a multimeter reads 1.302 V.
The Comb PCB Motor spinning.
Close-up of the PCB from the Comb PCB Motor, showing ferrous screws in the middle.
Rotor with magnets inside and stator PCB with bearing holder and bearing.
From left to right: 3d printed bearing holder, stator PCB and 3d printed rotor (without the magnets yet).
The "C'mon, do something" meme with a screenshot of PCBWay's SMT order tracking system, showing the order stuck in "Production Files Preparation" since March 25, 2025.
A small black PCB with an STM32-compatible microcontroller (FCM32F042F6P6 clone) and a USB interface.
Four arc segment magnets resting on a safety warning about neodymium and samarium cobalt magnets.
Section view of the Comb PCB motor showing the PCB stator, a plastic rotor that holds the magnets and and a single bearing assembly.
Simple, cheap and very accurate circuit used to read the resistance of a PT100 to measure its temperature. It only uses one rail to rail, low offset opamp and a few passives.
Stack of PCB business cards. The top card is flipped to show drill size, trace width, and trace spacing references, along with a ruler.
Themal image of a PCB, a small poor IC is getting quite hot.
Gear selector PCB, hall effect sensors are used in order to tell the car which gear is selected.
DHO804 oscilloscope in XY mode. The scope is connected to the audio jack of my laptop and it shows my logo on screen.
Realistic render of the IoT HDMI mux PCB: a mostly square PCB with some ICs and parts, a USB C connector and three HDMI connectors. A PCB antenna can be spotted at the top area of the PCB.
Screenshot of the almost finished layout of the IoT HDMI mux PCB.
Rigol DHO804 with a sticker that changes the model to DHO824 and 200MHz (instead of the original 70MHz).
A photograph of a Rigol DHO804 oscilloscope.
Realistic render of the Comb PCB Motor: a round green PCB with two large ICs, a USB C connector and other smaller parts scattered around. Four large shiny magnets are placed on top of the coils.