ATtiny85 Phone Charge Guard

5 months ago 361
  • Description
  • Documents
  • BOM
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Description

The ATtiny85 USB Phone Charge Guard controls and monitors the charging of phones and other devices. Voltage, current, power and energy are constantly measured via the INA219 and compared with the user limit values. It cuts off the power supply via a MOSFET when a condition selected by the user is reached. The user settings are saved in the EEPROM.

Button Function
RESET Reset all values
SELECT Select limit type in pause mode / change displayed parameter in charging mode
INCREASE Increase limit value
DECREASE Decrease limit value
START Start/pause charging
Limit Type Function
mAh Stop charging when electric charge reaches the selected value
mWh Stop charging when provided energy reaches the selected value
mA Stop charging when current falls below the selected value (this usually correlates with the state of charge of the battery)
min Stop charging after the selected time in minutes

Project Video: https://youtu.be/9DHBoqHImcM

IMG_20200718_184849_x.jpgIMG_20200718_152748_x.jpgIMG_20200718_152855_x.jpgIMG_20200809_133537_x.jpgIMG_20200809_133707_x.jpg

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This work is licensed under Creative Commons Attribution-ShareAlike 3.0 Unported License. (http://creativecommons.org/licenses/by-sa/3.0/)

Documents

Phone Charge Guard

PhoneChargeGuard_v1.0

BOM

ID Name Designator Footprint Quantity BOM_Manufacturer Part
1 MMBT3904 Q2 SOT-23_1 1 2n3904S-RTK/PS
2 OLED 0.91 OLED1 I2C OLED 0.91 1 SSD1306 I2C OLED
3 POWER OUT USB2 USB-2.0-A-F-90-JCJ-H9.36 1 USB-A-F-90
4 POWER IN USB1 USB-M-48 1 USB-05
5 TS24CA SET4,SET3,SET2,RESET,SET1 SW-SMD_TS24CA 5 TS24CA
6 10k R7,R4,R1,R10,R3,R9,R8,R5 0603 8 0603WAF1002T5E
7 1k R6 0603 1 0603WAF1001T5E
8 ATtiny85 U1 SOIC-8_208MIL 1 ATTINY85-20SU
9 HT7333-A U3 SOT-89-3_L4.5-W2.5-P1.50-LS4.2-BR 1 HT7333-A
10 INA219 U2 SOT-23-8_L3.0-W1.7-P0.65-LS2.8-BL 1 INA219AIDCNR
11 100n C1,C3 0603 2 CC0603KRX7R9BB104
12 10u C4,C5 0603 2 CL10A106MA8NRNC
13 47u C2 1206 1 CL31A476MQHNNNE
14 AS3621 Q1 SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR 1 AS3621
15 R008 R2 2512 1 LCSR2512FR008Q9L

Attachments

Filename Download
PhoneChargeGuard_firmware_v1.0.zip
PhoneChargeGuard_case_3dprint.zip
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