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Current sense

westonb·little-bee-B1·pcb/current-sense/current-sense.kicad_pcb

Current sense PCB layout, top view — open source PIC board by westonb
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About the Current sense PCB

Current sense is an open source PIC PCB design by westonb, published on GitHub under the CC-BY-SA-4.0 license. It is a 4-layer board measuring 130 × 25 mm, with 105 components from 39 distinct parts.

Its main chip is the PIC16F1776-ISS, from the PIC family. Other key parts include the HMC1041Z, AD8129, TMUX1219, TLV3542 and MCP1640. By type, the board carries 40 resistors, 36 capacitors, 9 ICs, 8 connectors, 4 diodes and 3 switches.

It belongs with the test & measurement designs in this gallery.

From the project

A high performance current & magnetic field probe

The Little Bee B1 is an open source magnetic field and current probe based on an Anisotropic Magneto-Resistive (AMR) magnetic sensor. It directly senses magnetic fields and measures current with a current sensing attachment consisting of a gapped ferrite toroid that is placed around a wire, establishing a fixed relation between the current in the wire and magnetic field the sensor is subject to.

Current sense, from the project README
From the project README

Main components on the Current sense

HMC1041ZAD8129TMUX1219PIC16F1776-ISSTLV3542MCP1640LM4041LP-ADJ

Current sense bill of materials (BOM)

105 components, 39 distinct parts.

QtyPartRefs
1
HMC1041Z
U1
1
AD8129
U2
2
TMUX1219
U3, U6
1
PIC16F1776-ISS
U4
1
TLV3542
U5
1
MCP1640
U7
2
LM4041LP-ADJ
U8, U9
1
FDC6327C
Q1
4
M3
J1, J2, J4, J5
1
Tag Connect
J3
1
Conn_Coaxial
J6
1
AA Holder
J7
1
DNP
J8
1
2k
RV1
2
SW_Push
SW1, SW2
1
SW_SPDT
SW3
1
LED_ARGB
D1
2
BAT54SLT1G
D2, D3
1
NTSAF345T3G
D4
2
Ferrite_Bead_Small
FB1, FB2
Show 19 more
QtyPartRefs
1
4.7u
L1
8
22u
C1, C13, C14, C17, C20, C21, C22, C33
21
1u
C2, C3, C5, C8, C9, C10, C11, C12 +13
1
10p
C4
1
22p
C6
1
750p
C7
4
DNP
C18, C24, C35, C36
9
4.7k
R1, R2, R10, R11, R23, R24, R25, R27 +1
2
105
R3, R7
2
220
R4, R13
3
43
R5, R6, R20
6
1.43k
R8, R9, R12, R15, R17, R19
7
32.4k
R14, R22, R32, R33, R34, R35, R40
1
470
R16
1
0
R18
1
102k
R21
3
4.7
R26, R36, R37
3
DNP
R29, R38, R39
2
130
R30, R31

Current sense design files

The KiCad project lives in the westonb/little-bee-B1 repository on GitHub; these links point at the commit this page was built from.

Current sense: common questions

What microcontroller does the Current sense use?

The Current sense is built around the PIC16F1776-ISS, from the PIC family.

How big is the Current sense PCB?

The Current sense measures 130 × 25 mm, has 4 copper layers and is 1 mm thick.

How many components are on the Current sense?

105 components, from 39 distinct parts. The full bill of materials is listed on this page.

Where can I download the Current sense design files?

From the westonb/little-bee-B1 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Current sense design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which westonb chose for the repository.

Can I test firmware for the Current sense without the hardware?

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

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