# 1. Overview #
Powerbank based on FP6277 boost converter with 5V and 3.3V output up to 3A. Choose a good 18650 Li-Ion battery with a low internal resistance which is capable of delivering up to 7A!
Designed this as a mini flashlight for my daughter. It had a 20000mcd white led (at about 25mA) and is powered by a single 18650 Li-Ion cell. As my stock of 18650s are unprotected, I added OC and OD protection with the trusty DW01+G and use a TP4056 to charge it (@ 560mA) from a male USB plug on the tail. The circuit is switched with a momentary switch as I do not want her to forget it on.
This board forms part of a 9 * 18650 battery charger using 3 INA3221 chips to capture the voltage/current during charging.
The I2C INA3221 register data is written via the WEMOS PRO MINI to an INFLUX database every 10 seconds. The data is surfaced through a GRAFANA dashboard. Each INA3221 has its own I2C address hardwired through links to the A0 pin i.e. (0x40, 0x41, 0x42)
More information on the...
Numbers are examples while hardware is being sourced.
Cell Counter per Charger: 8
Chargers per width: 5
Chargers per depth: 6
Total Cells: 240
Dispensors total: 10
Cells per dispensor:100+
- Supervision/advise on features and design of schematics
- Develop breadboard concept
- Nextion GUI development
- Ardunino Application
- Webbase database ( Could int...
This is a battery powered sensor board based on the ESP8266 (ESP-12F).
By using a TPL5111 chip the battery consumption can be reduced to about 1µA when the ESP is not enabled. When the TPL5111 chip receives 5V at it's wake up pin this will turn the ESP on by enabling the 3.3V voltage regulator. At this moment you can run any program you want. If you want to turn the ESP off again you have to drive...
Progetto per la realizzazione di un circuito che determina lo stato di carica di una batteria della serie 18650 o similari.
I quattro Led visualizzano riospettivamente
- 0% carica con **nessun** led acceso
- Ul25% carica con il primo led **rosso** acceso
- Ul50% carica con il secomdo led **rosso** acceso
- Ul75%carica con il terzo led **giallo** acceso
- Ul100% carica con il quarto led **verde**...
WORK IN PROGRESS - NOT READY FOR MANUFACTURE
Looking for collabortors to get this design ready for a a production build.
Project to build a 7S 5P 18650 battery state monitoring system.
Note: the BQ76930 is specifically configured for a 7 series pack.
Note Table 8-2. Cell Connections for 7S Pack Configuration bq76930
Thanks to scttnlsn for the he...
One of older projects imported from Eagle. It has three 18650 cells onboard and can charge them. Relays are needed for switching cells in parallel for charging or in serial to give 10-12 volts for LED strip.
Although USB connector used, it needs about 7,5 volts for success charging due to used LM3177 voltage drop.
Project was made and tested from Eagle, but imported to EasyEDA without any tes...