Component Selection
Block diagram
- Block diagram Freewatch V1 (source in the repo)
Electronics components
The total price of the electronics components is around 84 Euro ($112,
CHF 102).
This price does not include the PCB, backlight, assembly costs nor the
watch case.
Function | Part number | Manufacturer | Package | Supplier | Supplier ref. | Price | Symbol | Footprint | Comment |
---|---|---|---|---|---|---|---|---|---|
MCU | EFM32GG330F1024 | Silicon Labs | 9x9 (QFN64) | Mouser | 904-EFM32GG330F1024 | 7.44 CHF | Done | Done | |
GPS | M10478-A1 | Antenova | 13x9.5 | Digikey | 627-1052-2-ND | 15.92 EUR | Done | Done | |
Display memory LCD 128x128 | LS013B7DH03 | Sharp | 26.6x30.3 | Mouser | 852-LS013B7DH03 | 17.81 CHF | Done | N/A | |
Pressure sensor | MS5806-02BA | Meas. Spec. | 6.4x4 | Digikey | 223-1201-1-ND | 15.93 EUR | Done | Done | |
Accelerometer + compass | LSM303CTR | ST | 2x2 (LGA-12) | Mouser | 511-LSM303CTR | 2.98 CHF | Done | Done | |
Ambient light sensor | MAX44009 | Maxim | 2x2 (UTDFN) | Mouser | 700-MAX44009EDT+T | 3.46 CHF | Done | Done | |
Buzzer | SMT-0540-S-R | PUI Audio | 5x5 | Mouser | 665-SMT0540SR | 2.98 CHF | std lib | Done | |
Battery | LP503035 | ? | 30x35x5 | Adafruit | 1578 | 7.95 USD | N/A | N/A | |
Battery charger | bq24072 | TI | 3x3 (QFN) | Mouser | 595-BQ24072RGTT | 2.80 CHF | Done | Done | |
Fuel gauge | MAX17047 | Maxim | 3x3 (TDFN) | Mouser | 700-MAX17047G+ | 2.54 CHF | Done | Done | |
Voltage regulator | TPS780180300 | TI | 2x2 (SON-6) | Mouser | 595-TPS780180300DRVR | 1.08 CHF | Done | Done | |
External memory (microSD) | 1010030368 | Amphenol | 13.3x14.1 | Mouser | 523-101-00303-68 | 1.07 CHF | Done | Done | |
Switch | EVQ-P4MB3K | Panasonic | 3.4x6.2 | Mouser | 667-EVQ-P4MB3K | 0.78 CHF | std lib | Done | |
GPS chip antenna | W3011A | Pulse | 1.6x3.2 | Mouser | 673-W3011A | 1.77 CHF | Done | Done | |
micro USB connector | 1551629-3 | TE Conn. | 5x8.2 | Mouser | 571-1551629-3 | 1.51 CHF | Done | Done | Splash proof! |
FPC connector (LCD) | 503480-1000 | Molex | 3.6x6.7 | Mouser | 538-503480-1000 | 1.33 CHF | N/A | Done | |
Vibrating motor | 28821 | Parallax | d10x3 | Mouser | 619-28821 | 3.86 CHF | N/A | N/A | |
Low noise amplifier | MAX2659ELT+T | Maxim | 1x1.5 | Mouser | 700-MAX2659ELT+T | 1.46 CHF | Done | Done | Not present in pcb v1 |
High-side switch | ADP198ACPZ-R7 | Analog Devices | 2x2 (LFCSP) | Mouser | 584-ADP198ACPZ-R7 | 1.06 CHF | Done | Done | |
32.768kHz crystal | AB26TRB-32.768KHZ-T | ABRACON | 2.1x6 | Mouser | 815-AB26TRB-32.76KHZ | 0.55 CHF | Done | Done | |
48MHz crystal | ABM11-48.000MHZ-D2X-T3 | ABRACON | 2x1.6 | Digikey | 535-10951-2-ND | 1.01 EUR | Done | Done |