40 lines
1.5 KiB
Markdown
40 lines
1.5 KiB
Markdown
# Battery management system, based on esp8266 wireless SoC
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An ESP8266's input voltage is 2.8-3.6V, which makes it ideal for being powered
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from a single LiFePo4 cell, whoose nominal voltage is 3.2V
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The second premise is that the ESP8266 has a WiFi capability on board already,
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this can send the voltages and / or perform more complex tasks on a floating
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potential and does not need additional power supply, or setpup / stepdown
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convertors
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## High level design
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- Use of ESP8266, directly connected to a single cell
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- Decision to use internal, or external ADC to measure voltage,
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have to test the precision for multiple, averaged measurements. Should be
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precise enough, if WiFi is turned off and no PWM is used
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### Architecture
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ESP 8266 pins
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1, 3V3 --> To battery + 2, RX --> NC
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3, RST --> PULL UP 4, IO0 --> PWR Dump relay start
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5, EN --> PULL UP 6, IO2 --> FREE, blink indicator?
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7, TX --> NC 7, GND --> To Battery -
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## Hardware requiered
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- ESP8266, version not dependent. v01 will be used for testing
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- 8 pins (Dupont male) exposed, only internal measurement possible
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- some cabling needed, should be simple.
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- Wifi router in range, so it can send data to somewhere
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- additional hardware required for a running database, or visualization
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software
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## Software requirements
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- obviously a NW infrastructure, TCP / http capable
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- Linux server
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- InfluxDB ?
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- SQLite ?
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- Dockerized ?
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