Note TP = " Trinket Pedometer "
This biggest challenges for the project are :
1) How do I keep the size small and at the same time keep it functional as a regular pedometer ? ( The last thing I want is a huge box hanging off my belt loop
I will use an old dead WiFI adapter housing and connector for the Trinket's housing
and data collection
2) How do I power/recharge the dang thing ?
Using the old USB-A male connector, I will use this for both data collection and power - When I plug
the device in the usb dock pictured in future future diagrams included with this blog, it will charge the batteries every time and download data from the TP simultaneously . A VB program will
collect and store data from current walks from memory stored in the TP
I want to use small batteries but at the same time have enough charge for a 5 mile walk
at 3 to 5 mi/hr
I have decided to use a Li-ion cordless phone battery to power the device. I figure if the
talk time on my cordless handset is about 2 hours, this will more than enough walk time for
3) How do I upload data from the device ? Do I want wired or wireless data transfer ?
See the above regarding the USB connector scavenged from the busted WiFI
4) How do keep it inexpensive to build ( if it is going to cost more than the a FitBit,
what's is the point, right ?? ). I want to use stuff I can find around the house.
These are my expenses so far :
Digital Pedometer - $1
Cordless phone battery - Donation - $0
Busted WiFi Adapter - Donation -$0
Adafruit -Trinket Pro -$10
Construction time - Donated - 0$
Total cost - $11
Cheapest Fitbit at Walmart - $60
(I think I'm good with the price )
( more to come in the next blog )