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Scale ltc6915

IoTReady·low-power-nrf52-weighing-scale·design/scale_ltc6915/scale_ltc6915.kicad_pcb

Scale ltc6915 PCB layout, top view — open source Nordic nRF board by IoTReady
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About the Scale ltc6915 PCB

Scale ltc6915 is an open source Nordic nRF PCB design by IoTReady, published on GitHub. It is a 2-layer board measuring 70 × 40 mm, with 71 components from 44 distinct parts.

Its main chip is the MDBT42Q, from the Nordic nRF family. Other key parts include the BQ21040, TPS7A0233PDBV, LTC6915, LM2703 and LP2985-5.0. By type, the board carries 31 capacitors, 11 resistors, 8 ICs, 5 diodes, 4 connectors and 4 inductors.

It belongs with the iot & wireless designs in this gallery.

From the project

https://iotready.co/low-power-nrf52-weighing-scale/

Here one can find all the Hardware design files. We tried 3 different designs for the weighing scale project and settled with the "HX711" based design as our final. So you will find the final design explained on the main page. The other two designs of "LPV821" and "LTC6915" based weighing scales are also fully functional, one may have to play around with the adc functions in the firmware though.

Main components on the Scale ltc6915

MDBT42QBQ21040TPS7A0233PDBVLTC6915LM2703LP2985-5.0ADS8320E_2K5LM4140CCM-2.5

Scale ltc6915 bill of materials (BOM)

71 components, 44 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
MDBT42Q
U1
1
BQ21040
U2
1
TPS7A0233PDBV
U3
1
LTC6915
U4
1
LM2703
U5
1
LP2985-5.0
U6
1
ADS8320E_2K5
U7
1
LM4140CCM-2.5
U8
1
IRLML6401
Q1
2
AO3400
Q2, Q3
1
Q13FC1350000400
Y1
1
USB_B_Micro
J1
1
Conn_02x03_Odd_Even
J2
1
Load cell
J3
1
Conn_01x04
J4
1
Battery_Cell
BT1
1
EINK_GDEW0154M09_154IN_200X200
EINK1
1
SW_SPST
SW1
1
ON/OFF switch
SW2
1
LED
D1
Show 24 more
QtyPartRefs
4
SD103AWS
D2, D3, D4, D5
1
18nH
L1
1
10uH
L2
1
10uH/250mA
L3
1
3.3uH
L4
2
1uF
C1, C3
4
1uF
C2, C7, C8, C9
2
8pF
C4, C6
1
0.1uF
C5
8
1uF/50V
C10, C11, C12, C13, C14, C19, C20, C21
1
10uF
C15
1
0.1nF
C16
3
1uF
C17, C18, C29
3
4.7uF
C22, C28, C31
3
0.1uF
C23, C24, C25
1
100nF
C26
1
4.7pF
C27
1
10nF
C30
2
1.1k
R1, R3
3
10k
R2, R10, R11
1
1M
R4
1
0.47
R5
2
1.2k
R6, R9
2
3.9k
R7, R8

Scale ltc6915 design files

The KiCad project lives in the IoTReady/low-power-nrf52-weighing-scale repository on GitHub; these links point at the commit this page was built from.

Scale ltc6915: common questions

What microcontroller does the Scale ltc6915 use?

The Scale ltc6915 is built around the MDBT42Q, from the Nordic nRF family.

How big is the Scale ltc6915 PCB?

The Scale ltc6915 measures 70 × 40 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Scale ltc6915?

71 components, from 44 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 Scale ltc6915 design files?

From the IoTReady/low-power-nrf52-weighing-scale repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Scale ltc6915 design in my own project?

The repository has no license, so all rights stay with IoTReady. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Scale ltc6915 without the hardware?

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

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