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🌴 A BLE-connected outdoor UV sensor keychain 🗝
power
LiPO
wireless
BLE
sensor
UV Index
mcu
nRF52
battery life
5 days
bom items
13
bom cost
USD $50.47
vendors
4
completed
July 2019
Start
Code
PCB
Bill of Materials
Design
Power
CSQ
Resources
Schedule
Timeline
Quality
For future improvements
(Layout) Mark polarity for power connectors to safe guard against reverse polarity. E.g. JST connector should have
+
and
-
labels on silkscreen
(Power) Buy good quality LiPo / battery and power connectors E.g. JST connectors
(Prototype) Do not use modules as they are big and bulky. E.g.
MDBT42Q
(Schematic) Use DP3T to power on, wireless off and wireless on options instead of 2 switches
(BOM) Use a smaller and brighter RGB LED
(Layout) Use a single layer board with only SMD parts so that a housing can be catered for the battery at the back
(Power) Use a smaller rechargeable coin cell battery E.g. CR2450