Soldering and assembling

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Dilshan R Jayakody edited this page Oct 26, 2019 · 10 revisions

Following tools are necessary to assemble the seven segment display module:

Soldering iron with tiny tip (or SMD rework station)
Solder
Solder flux
A couple of tweezers
Bench magnifying glass or microscope
Nipper or cutting tool

During soldering try to solder small SMD components first. To overcome most of the problems we recommend to solder this board in the following order:

Solder U1 (STM32F103CBT6) IC first.
C3, C4, C9, R1, C6, C8, R13, R14.
J2 pin header.
Y2 - 8.00MHz crystal.

After soldering above components, connect "ST-Link V2 programmer" to the J2 terminal and flash the U1 MCU. The programming procedure is described in the following section of the documentation.

Following the firmware upload, solder rest of the components as listed below:

All the remaining resistors including R5 - R12, R15 - R24, R25, R2 - R4.
All the remaining capacitors such as C1, C2, C5, and C7.
All the transistors starting from Q1 to Q11.
U12 voltage regulator.
Y1 - 32.768kHz crystal.
FB1 and J1.
J3 pin header.
Seven segment display units - U2 to U11.
BZ1 and BT1.

View of the completely welded module is quite similar to the following figure: