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Hardware and electronics
"The power of Raspberry Pi 5 in a compact form factor for deeply embedded applications" (CM5 website).
By default SPIRIT proposes the 4GB RAM, 64GB eMMC version of the CM. It is possible to use a different CM5 variant (for example to increase the RAM to 16GB).
We are aware of the fact that this is not the most efficient choice, an upgrade will probably happen after the 1st prototype is produced
For schematics, PCB layout etc. the newest major release of KiCad is used.
All EDA files are available through this repository (see the 'EDA-kicad' folder). The best way to view them is to clone the repo to your machine and use KiCad to open the project file 'cm5-carrier.kicad_pro'.
This is the only custom electronic component in this project (apart from the chassis).
It interfaces between the Compute Module and the rest of the electronics.
Capacitive LCD Display TFT MIPI Dimensions: 5.5" (139.70mm) 1280px x 720px
will probably change to a better one
Can be completely disconnected by the user using a physical switch.
The battery is mounted such that it can be easily uninstalled for replacing or privacy reasons. The user is free to swap the battery for any compatible model. It is also possible to run the phone without a battery, or using an external one if you attach long enough wires.
An added benefit is that the user can easily replace an empty battery for a charged one - effectively eliminating the need to wait for the phone to charge. An external battery charger can also be used for unmounted batteries.
SPIRIT is compatible with Arducam cameras e.g. the 64 MP Hawkeye or the more affordable 16 MP Autofocus.
The camera module can be completely powered off by the user using a physical switch.
Below are the stats for the Hawkeye:
| Name | Sensor Resolution | Zoom | Field Of View |
|---|---|---|---|
| Pi Hawk-eye | 64MP (9152 x 6944 pixels) | 10x (digital) | 84 degrees |
Sensor: 1/1.7" stacked CMOS image sensor, 0.8 μm pixel size Lens: f/1.8 aperture, 8 cm–∞ focal range, motorised focusing Max Resolution: 9152×6944 stills; 1080p 30 fps video
For more details see the product page
(For now there is only one camera for simplicity and cost reduction)
EC25VFA-512-STD (old option)
Can be completely powered off by the user using a physical switch. The EG25 is also used by the PinePhone project.
2 x CMR-15062S-67
The speaker system consists of a pair of speakers mounted symmetrically facing upwards.
The fingerprint scanner is located on the back of the phone and has a sensing area of 8x8mm. It is rated for 10 million finger placements and can store up to 50 templates.
False acceptance rate: 1/500k (per finger) False rejection rate: 1.4-3.5 %
The connector offers ingress protection and support for USB 4.0. (RPi CM5 is limited to 3.0).
This phone has a TRRS headphone jack. This way the user can decide between wireless or wired.
Can be completely powered off by the user using a physical switch. Omnidirectional with a theorethical frequency range 20 Hz - 10 kHz. Sensitivity: -26dB ±3dB @ 94dB SPL. Digital output (I2S)
The power, volume and programmable buttons are identical, rectangular, tactile switches with a life expectancy of 30k cycles.
The Programmable Button's function can be customized by the user. For example, it can be used for quick launching an app, instantly dialing a saved contact, toggling sound settings (silent, vibrate, sound) etc. The list of potential use cases is very long. One of them could be enabling small children or elderly people to instantly call for example a parent, or supervisor in case of emergency. Another could be to immediately launch the camera app to quickly capture a moment.
SPIRIT has 4 physical switches that cut off the power lines to specific modules ensuring they are 100% inactive and not drawing power. Notice, you can also completely disconnect the battery. This is a very useful feature for people who want to have direct control over the hardware and want to protect their privacy without having to trust software.
| Switch Number | Module |
|---|---|
| 1 | Microphone |
| 2 | GPS/GSM EC25 chip |
| 3 | Camera |
| 4 | Battery |
will possibly add a SIM card switch
1W 3V white, cool LED.
Toggling on/off can be binded to the programmable button.
coming soon
work in progress, see https://github.com/V3lectronics/SPIRIT/issues/13
coming soon