2 layers
MP Tracker
elektra42/freifunk-open-mppt
Open hard- and software solar maximum power point tracker
70 parts89
2 layers96.3 × 93.6 mm
ESP OpenMppt
ISEMS/ISEMS-ESP3211ISEMS-Port for Solarnodes based on ESP32 Microcontrollers
- Size
- 96.3 × 93.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 75
- Nets
- 63
- Pads
- 217
- Tracks, vias
- 722, 50
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 7 Oct 2019
- Updated
- 5 May 2020
Overview
ESP OpenMppt is an open-source printed circuit board by ISEMS, from the ISEMS/ISEMS-ESP32 repository on GitHub. It is a 2-layer board of 96.3 × 93.6 mm with 75 parts on 63 nets, routed with 722 tracks and 50 vias.
It is built around the ESP32-WROOM-32U, MC34063 and TL081, with the SK84 and BC817-40 among its other parts. Its parts include 27 resistors, 16 capacitors, 9 diodes, 4 ICs and 4 transistors. It belongs with the ESP32 boards of this library.
Main components
5
ESP32-WROOM-32U
SMD,19.2x18mm-40℃~+85℃ -97dBm 2.4GHz 20.5dBm 3V~3.6V Bluetooth4.2 ESP32-DOWD UART、SDIO、SPI、I2C、GPIO、PWM、ADC、DAC、CAN SMD,19.2x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
MC34063
SOP-80℃~+70℃@(TA) 1 33kHz 3V~40V Adjustable Buck、Boost Built-in Inverting No SOP-8 DC-DC Converters ROHSHXY MOSFETDC-DC ConvertersTL081
SOP-8-18V~18V -20℃~+85℃ 1 1.8mA 100pA 200nA 20V/us 3MHz 3mV 85dB Built-in compensation SOP-8 Operational Amplifier ROHSGcoreOperational Amplifier
SK84
SMB(DO-214AA)SMC Schottky Diodes ROHSGOODWORKSchottky Diodes
BC817-40
SOT-23-65℃~+150℃ 1 NPN 100MHz 100nA 250 345mW 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSNexperiaBipolar (BJT)
README
README.mdISEMS-ESP32
This is a port of the ISEMS solar node software for ESP32 Microcontrollers from Espressif Systems. Since the OpenWRT/Linux tool is based on LUA we have chosen the ESP32 version of NodeMCU as the firmware base.
You can use a ESP32 board/module like NodeMCU, WROOM, WROVER and connect it to the serial port of the Freifunk OpenMPPT Solar controller. Simply connect GND, 3V3 and RX (OpenMPPT) <--> TX (ESP32) Pin 17, TX (OpenMPPT) --> RX (ESP32) Pin 16.
It is desirable to use a switched mode DC/DC buck converter instead of the linear voltage regulator of the Freifunk OpenMPPT. If the ESP32 operates as WiFi client, we might get away with the 100mA rating of the linear voltage regulator, but we do waste energy. If the ESP32 is set to software AP or software AP + software AP client, the ESP32 and the ATmega8 in the Freifunk OpenMPPT will lock up, due to insufficient power supply.
A Freifunk OpenMPPT pcb with ESP32 WROOM integrated is currently in the design phase. So stay tuned!
Parts
75| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 1k | Resistor_SMD:R_0805_2012Metric | R4, R7, R9, R10, R27, R31, R32 |
| 5 | 470n | Capacitor_SMD:C_1206_3216Metric | C10, C12, C16, C17, C18 |
| 4 | MountingHole:MountingHole_4.3mm_M4_DIN965 | , , , | |
| 4 | 10k | Resistor_SMD:R_0805_2012Metric | R5, R13, R19, R24 |
| 4 | SK84 | Diode_SMD:D_2816_7142Metric_Pad3.20x4.45mm_HandSolder | D3, D5, D6, D8 |
| 3 | 100n | Capacitor_SMD:C_0805_2012Metric | C7, C9, C11 |
| 3 | 1N4001 | Diode_SMD:D_1206_3216Metric | D2, D7, D9 |
| 3 | 2k2 | Resistor_SMD:R_0805_2012Metric | R1, R6, R17 |
| 3 | 330u | Capacitor_SMD:CP_Elec_10x14.3 | C4, C6, C14 |
| 2 | 100p | Capacitor_SMD:C_0805_2012Metric | C1, C8 |
| 2 | 27k | Resistor_SMD:R_0805_2012Metric | R8, R20 |
| 2 | AO D403 | TO_SOT_Packages_SMD:TO-252-2Lead | Q2, Q4 |
| 2 | BC817-40 | TO_SOT_Packages_SMD:SOT-23 | Q1, Q3 |
| 2 | CONN_02X05 | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | P1, P3 |
| 2 | MC34063 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U1, U3 |
| 1 | ELEKTRONIK:Freifunk-Logo | ||
| 1 | ELEKTRONIK:elektra-hexenlogo | ||
| 1 | 1000u | Capacitor_SMD:CP_Elec_10x14.3 | C13 |
| 1 | 100n | Capacitor_SMD:C_1206_3216Metric | C2 |
| 1 | 100u | Inductor_THT:L_Toroid_Vertical_L10.0mm_W5.0mm_P5.08mm | L3 |
| 1 | 100u | Inductor_THT:L_Toroid_Vertical_L16.8mm_W9.2mm_P7.10mm_Vishay_TJ3 | L1 |
| 1 | 10u | Inductor_THT:L_Toroid_Vertical_L10.0mm_W5.0mm_P5.08mm | L2 |
| 1 | 12k | Resistor_SMD:R_0805_2012Metric | R15 |
| 1 | 15k | Resistor_SMD:R_0805_2012Metric | R26 |
| 1 | 1N4148 | Diode_SMD:D_1206_3216Metric | D1 |
| 1 | 22k | Resistor_SMD:R_0805_2012Metric | R11 |
| 1 | 2k49 | Resistor_SMD:R_0805_2012Metric | R21 |
| 1 | 33k | Resistor_SMD:R_0805_2012Metric | R14 |
| 1 | 3k3 | Resistor_SMD:R_0805_2012Metric | R23 |
| 1 | 3k9 | Resistor_SMD:R_0805_2012Metric | R12 |
| 1 | 470R | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 470u | Capacitor_SMD:CP_Elec_8x10 | C3 |
| 1 | 47R | Resistor_SMD:R_0805_2012Metric | R22 |
| 1 | 4K7 | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 6V2-SOT23 | Diode_SMD:D_1206_3216Metric | D4 |
| 1 | 6k8 | Resistor_SMD:R_0805_2012Metric | R16 |
| 1 | CONN_01X02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | P2 |
| 1 | ESP32-WROOM-32U | RF_Module:ESP32-WROOM-32U | U4 |
| 1 | Screw_Terminal_01x06 | TerminalBlock_RND:TerminalBlock_RND_205-00236_1x06_P5.08mm_Horizontal | J1 |
| 1 | TL081 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U2 |
The 73 most common of 75 parts.
Questions
How big is the ESP OpenMppt PCB?
It measures 96.3 × 93.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ESP OpenMppt use?
75 parts, built around the ESP32-WROOM-32U, MC34063, TL081 and SK84. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the ESP OpenMppt KiCad files?
From the ISEMS/ISEMS-ESP32 repository on GitHub, at the commit this page was made from: the board is FF-ESP32-OPENMPPT-HARDWARE/ESP-OpenMppt.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the ESP OpenMppt design in my own project?
Its repository states no licence, so its author keeps all rights: ask ISEMS before reusing the design.
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