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RotorHazard 6 Node STM32

RH_6_node_STM32_intro_img

Features

  • Supports 1 to 6 RX5808 nodes
  • Board size is 97mmx87mm, with cut-outs for an XT60 & Raspberry Pi connectors
  • The Raspberry Pi plugs directly into the PCB in a raspberry Pi 'hat' style, to keep things compact
  • Instead of multiple Arduinos, the board uses a single STM32 processor on a 40 pin module, mounted on the PCB
  • The STM32 firmware can be updated via the RotorHazard web GUI using the 'Update Nodes' button (in the 'System' section on the 'Settings' page)
  • The same server and node source code supports both the 6 node STM32 and the (existing) multi-Arduino boards
  • Supports power / battery monitoring and a buzzer (low-battery alarm)
  • INA219 (Current sense IC) & DS3231 (Real Time Clock) + RTC battery can be mounted directly to the PCB
  • Connector pads for LED-strips & dedicated regulator
  • Fans can be automatically switched on based on raspberry pi temperature.

PCB build instructions can be found here

PCB:
RH6_Node_PCB_Both

Cost

The cost of the required parts is approximately £74 (~102.60 USD)

For each node add £6, so all 6 nodes would add £36 (~49.90 USD)

All the optional parts add approximately £23 (~31.90 USD)

To fit all parts to the board will cost approximately £133 (~184.40 USD)

Note: The above costs includes the raspberry pi 3b + SD card. Mouser & Banggood were used in the above costings, parts may be cheaper from other suppliers

Bill of Materials (BOM)

The PDF version of the BOM can be found here, the PDF version contains more information and suggested parts / suppliers

Required

For the PCB:

Reference Quantity Part No. Notes
PCB 1 Download the gerber files You can upload the gerbers files to your favourite PCB supplier or click here to buy from PCBway
Keep default options but consider changing:
- The solder mask colour
- Select quantity 10 which doesn't cost any more
P12 1 2.54mm 20x2 8.51mm tall header Single strips also work
P1 1 XT60 Male -
R2, R7, R8, R9, R11, R12, R13 7 100k ohm 5% 0805 resistor Buy some extra in case you drop one
R3, R10 2 10k ohm 5% 0805 resistor Buy some extra in case you drop one
U2, U3 2 MP1584 -
U2, U3 16 2.54mm header pins -
U6 1 STM32F103C8T6 -
RX1, RX2, RX3, RX4, RX5, RX6 1-6 RX5808 1 of these is required for each node you wish to fit

For the timer assembly:

Name Quantity Notes
RASPBERRYPI_3B+ 1 Alternative: Raspberry Pi 4
8GB+ Micro SD card 1 Any Micro SD card between 8GB and 64GB will work

You will also require some 3D printed parts for the case and the 11.5mm 3D printed stand offs. If you wish to use a different case then 12mm standoffs should work.

Details on 3D printed parts and mechanical assembly can be found here

Optional

For the PCB:

Reference Quantity Part No. Notes
U5 1 DS3231SN Fit if you want the real time clock (RTC), alternatives: DS3231S#T&R, DS3231SN#, DS3231S#
BT1 1 Keystone Electronics 1069 Fit if you want the real time clock (RTC)
BT1 1 CR1632 battery Fit if you want the real time clock (RTC), alternatives: CR1620, CR1616
R1 1 0.1 ohm 2512 1% resistor Fit if you wish to use the current sense IC
U1 1 INA219AIDR Fit if you wish to use the current sense IC, alternatives: INA219AID, INA219BID, INA219BIDR
C1, C2 2 100nF X7R 0805 capacitor These are decoupling capacitors for INA219 and DS3231
D1, D3 2 0805 LED Fit if you want the on-board power and status LED's, not really needed
R6, R29 2 220 ohm 5% 0805 resistor Fit if you want the on-board power and status LED's, not really needed
P4 1 3 pin JST SM Female Fit if you want to use RGB LED rope / tape
U4 8 2.54mm header pins Fit if you want to use RGB LED rope / tape
U4 1 MP1584 Fit if you want to use RGB LED rope / tape
BZ1 1 12mm x 9.5mm 5V buzzer Used for low voltage alarm
Q2 1 GSD SOT-23 N-Channel MOSFET Used for optional fan enable control, an example is IRLML6344TRPBF

For the timer assembly:

Name Quantity Notes
Raspberry Pi heat syncs 1 set Recommended to keep the pi cool
20x20x6mm heat sync 1-6 Recommended to keep the RX5808's cool
Thermal glue 1 tube Needed to attach the RX5808 heat syncs
LCD Voltage Screen 1 Used to show the battery voltage on the case

Tools

Required

  1. Soldering iron (chisel tip recommended to fit INA219 or DS3231 IC's)
  2. Solder
  3. Tweezers
  4. Digital Multi Meter (DMM), to measure voltage and resistance
  5. Screw driver for screws purchased
  6. Small flat head screw driver to adjust MP1584 voltage

Recommended

  1. Wire cutters / side cutters
  2. Helping hands
  3. Solder wick
  4. Hot glue & glue gun
  5. Pilers
  6. Insulation tape
  7. Copper tape with conductive adhesive
  8. Magnifying glass

Resources

RotorHazard 6 Node STM32 Schematic

Gerber files for RotorHazard 6 Node STM32 PCB

RotorHazard 6 node STM32 Board Build Guide

3D printed parts & mechanical assembly