Hub Dynamo Charger

• Charger
  • 4 Ah
  • max. 2 A
  • Charging time about 12 h
• BLE Cycle Sensor
• Cyclocomputer
  • OLED Display 64x128
  • Current speed
  • Maximum speed
  • Average speed
  • Trip distance
  • Total distance
  • Altitude
  • Trip elevation gain
  • Total elevation gain
  • Maximum altitude
  • Incline
  • Temperature
  • Trip time
  • Time
  • Stopwatch

STM32WB Feather Development Board

BoardSupportPackageWBfeather

Feather OLED 64x128 Display

Battery

Li-Ion Battery Pack HY-LINE H2B179.1

https://www.distrelec.ch/Web/Downloads/_t/ds/HY%20Line-H2B179.1_eng_tds.pdf, CHF62

• 1S2P-Configuration
• Vnom 3.6 V, 6666 mAh
• Integrated protection circuit
• Premium quality Sanyo cell NCR18650B
• Shrink foil
• No memory effect
• 100 g, 66 x 40 x 19 mm

Safety protection board

https://www.mouser.com/ProductDetail/Ultralife/UBBL23-FL, 4.8 Ah, $85

18650 Single cell

• 406-ASR00050, 3.7 V 2.5 Ah, $5
• https://www.distrelec.ch/de/akku-li-ion-6v-5ah-ansmann-1307-0001/p/30152666, 3.7 V 3.5 Ah, CHF25

DC-DC Converter 3.7 V (Battery) to 5.0 V (USB Out)

• mEZD41502A-A
  • 2.7 V - 4.2 V Input, 2 A, 5V Output, Step-Up Power Supply
  • Mouser # 946-MEZD41502A-A $15

DC-DC Converter 7 V (Rectified Dynamo Voltage) to 5 V (Charger, Feather Board)

• TRACO POWER TSR 1-2450
  • 6.5 - 35 V Input, 5 V / 1 A Output
  • Mouser # 495-TSR-1-2450 $6

• DF005S - DF10S Bridge Rectifier 1.5 A
• 470 uF / 35 V
• Transient voltage suppressor 24 V, peak pulse 600 W, SMBJ24A

Pressure (Altitude) Sensor

• 1 meter accuracy
• Mouser # 485-4494
• datasheet $7

Measurement

Voltage

• Dynamo voltage: 4 to 25 V
• Battery voltage: 2.5 to 4.2 V

Current

• Mouser # INA180A3, gain 100
• USB out current: Shunt 10 mOhm -> 2 A -> 2 V
• Battery charge current: Shunt 50 mOhm -> 0.5 A -> 2.5 V

-- Peter Schmid - 2022-01-21

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