HardLabs

Merlyn435

YeetTheAnson·Merlyn435-Flight-Stack·PCB/[MPU6500]FlightController/Merlyn435.kicad_pcb

Merlyn435 PCB layout, top view — open source ESP8266 board by YeetTheAnson

About the Merlyn435 PCB

Merlyn435 is an open source ESP8266 PCB design by YeetTheAnson, published on GitHub. It is a 4-layer board measuring 30.5 × 30.5 mm, with 69 components from 20 distinct parts.

Its main chip is the ESP8285H16, from the ESP8266 family. Other key parts include the AT32F435CGU7, SX1281IMLTRT, BMP388(TOKMAS) and MPU-6500. By type, the board carries 41 capacitors, 21 resistors, 5 ICs and 2 diodes.

It belongs with the robotics & motion, power & battery and sensors designs in this gallery.

From the project

Successor to the Merlyn411 25mm flight controller. The flight stack includes a 3in1 20mm flight controller and a 20mm ESC.

The Merlyn435 also upgrades the IMU from the MPU6500 to the LSM6DSK320X, which provides significantly better vibration noise rejection at $3.8\ \mathrm{mdps}/\sqrt{\mathrm{Hz}}$ compared to $10\ \mathrm{mdps}/\sqrt{\mathrm{Hz}}$. This results in cooler motors and more stable flights with fewer gyro filters, preventing issues such as mid throttle oscillation and flyaways.

Merlyn435, from the project README
From the project README

Main components on the Merlyn435

AT32F435CGU7ESP8285H16SX1281IMLTRTBMP388(TOKMAS)MPU-6500

Merlyn435 bill of materials (BOM)

69 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
AT32F435CGU7
ARTERY(雅特力)
U1
1
ESP8285H16
ESPRESSIF(乐鑫)
U2
1
SX1281IMLTRT
SEMTECH
U5
1
BMP388(TOKMAS)
BMP388
Tokmas(托克马斯)
U6
1
MPU-6500
MPU6500
TDK InvenSense(应美盛)
U17
1
NCD0805R1
RED
国星光电
D2
1
KT-0805G
GREEN
KENTO
D3
23
0.1uF
C1, C5, C10, C11, C13, C14, C15, C19 +15
4
10uF
C2, C3, C6, C7
4
10nF
C8, C9, C18, C20
3
10uF
C12, C23, C38
4
10pF
C16, C17, C31, C32
1
470nF
C21
2
22uF
C27, C28
10
12k
R1, R4, R6, R8, R9, R14, R15, R16 +2
1
15k
R2
1
2k
R3
6
5.1k
R10, R11, R17, R18, R21, R22
2
75
R12, R13
1
91k
R23

Merlyn435 design files

The KiCad project lives in the YeetTheAnson/Merlyn435-Flight-Stack repository on GitHub; these links point at the commit this page was built from.

Merlyn435: common questions

What microcontroller does the Merlyn435 use?

The Merlyn435 is built around the ESP8285H16, from the ESP8266 family.

How big is the Merlyn435 PCB?

The Merlyn435 measures 30.5 × 30.5 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Merlyn435?

69 components, from 20 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 Merlyn435 design files?

From the YeetTheAnson/Merlyn435-Flight-Stack 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 Merlyn435 design in my own project?

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

Can I test firmware for the Merlyn435 without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.

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