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Screwdriver antenna auto tuner

k8tar·screwdriver-antenna-auto-tuner·hardware/kicad/tuner.kicad_pcb

Screwdriver antenna auto tuner PCB layout, top view — open source ESP32 board by k8tar
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About the Screwdriver antenna auto tuner PCB

Screwdriver antenna auto tuner is an open source ESP32 PCB design by k8tar, published on GitHub under the MIT license. It is a 4-layer board measuring 100 × 70 mm, with 47 components from 31 distinct parts.

Its main chip is the ESP32 DevKit V1 30-pin (DOIT/NodeMCU-32S), from the ESP32 family. Other key parts include the OKI-78SR-3.3/1.5-W36-C, MAX3232ESE+, POLOLU-2990 and INA180A1IDBVR. By type, the board carries 15 capacitors, 8 resistors, 6 connectors, 5 ICs, 3 diodes and 2 transistors.

It belongs with the rf & radio and displays & leds designs in this gallery.

From the project

An open source Screwdriver Antenna Auto Tuner

An ESP32-based automatic controller for motorized HF screwdriver antennas.

This repository contains the firmware, generated KiCad design files, enclosure model, sourcing notes, build documentation, renders, and fabrication outputs for an in-vehicle automatic antenna tuner with:

- ESP32 control logic - OLED status display - motor drive with current-based stall detection - SWR measurement using an onboard directional coupler - detachable radio and antenna harnesses - Tarheel-style sensor support via the 4-wire antenna connector

Screwdriver antenna auto tuner, from the project README
From the project README

Main components on the Screwdriver antenna auto tuner

OKI-78SR-3.3/1.5-W36-CESP32 DevKit V1 30-pin (DOIT/NodeMCU-32S)MAX3232ESE+POLOLU-2990INA180A1IDBVR

Screwdriver antenna auto tuner bill of materials (BOM)

47 components, 31 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
OKI-78SR-3.3/1.5-W36-C
OKI78SR_3V3
U1
1
ESP32 DevKit V1 30-pin (DOIT/NodeMCU-32S)
ESP32-WROOM-32E
U2
1
MAX3232ESE+
MAX3232
U3
1
POLOLU-2990
DRV8871_CARRIER
U4
1
INA180A1IDBVR
INA180A1
U6
2
MMBT3904LT1G
MMBT3904
Q1, Q2
1
61300211121
12V_IN
J1
1
61300611121
RADIO_UNIVERSAL
J2
1
61300211121
RF_IN_SO239
J3
1
61300211121
RF_OUT_SO239
J4
1
61300411121
ANT_CTRL
J6
1
61300411121
DEBUG_UART
J8
1
1812L300PR
3A_PTC
F1
2
4.7k
R_CIV1, R_CIV3
2
10k
R_CIV2, R_IO12
1
PTS645VL58-2LFS
TUNE
SW1
1
PTS645VL58-2LFS
PARK
SW2
1
5943000201
FT37-43_1:30
T1
1
SMBJ13A-E3/52
SMBJ13A
D1
2
BAT46WJ
BAT46
D2, D3
Show 11 more
QtyPartRefs
1
EEE-FK1E101P
100uF_25V
C1
1
EEE-FK1C470P
47uF_10V
C2
8
CL21B104KBCNNNC
100nF
C3, C5, C6, C11, C12, C13, C14, C15
1
GRM21BR61C106KE15L
10uF
C4
1
08055A3R3CAT2A
3p3_NP0
C7
1
CL21C101JBANNNC
100pF_NP0
C8
2
CL21B102KBANNNC
1nF
C9, C10
1
RC0805FR-07150RL
150R
R3
1
RC0805FR-071KL
1k
R4
4
RC0805FR-074K7L
4.7k
R5, R6, R12, R13
2
RC0805FR-0710KL
10k
R7, R8

Screwdriver antenna auto tuner design files

The KiCad project lives in the k8tar/screwdriver-antenna-auto-tuner repository on GitHub; these links point at the commit this page was built from.

Screwdriver antenna auto tuner: common questions

What microcontroller does the Screwdriver antenna auto tuner use?

The Screwdriver antenna auto tuner is built around the ESP32 DevKit V1 30-pin (DOIT/NodeMCU-32S), from the ESP32 family.

How big is the Screwdriver antenna auto tuner PCB?

The Screwdriver antenna auto tuner measures 100 × 70 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Screwdriver antenna auto tuner?

47 components, from 31 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Screwdriver antenna auto tuner design files?

From the k8tar/screwdriver-antenna-auto-tuner repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Screwdriver antenna auto tuner design in my own project?

Yes, under the terms of its MIT license, which k8tar chose for the repository.

Can I test firmware for the Screwdriver antenna auto tuner without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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