Hello,

We have four new boards soon to be sent to production: LPS^2, LPS^2 Mini, LPS RPi and Blueberry:


=== LPS^2 ===
https://www.instagram.com/p/BOMsHQ8h54t/?taken-by=loligoelectronics
* First board of our new LPS^2 family.
* nRF52 as MCU, i.e. ARM Cortex M4F.
* USB.
* BLE.
* Can act as RFID tag (untested).
* Optional WiFi.
* DW1000 for UWB.
* Clock and sync handling/distribution for TDoA/AoA
* Accelerometer, gyro, compass, altimeter, thermometer.
* TCXO to eliminate the thermal drift of DWM1000.
* Optional external FLASH for data storage.
* LiPo charger with power either from USB or a small solar panel.
* Size: 34x52 mm, but it will most likely be a little wider in the production version.


=== LPS^2 Mini ===
https://www.instagram.com/p/BNr0aiZhzX-/?taken-by=loligoelectronics
* Second board of our new LPS^2 family.
* nRF52 as MCU, i.e. ARM Cortex M4F.
* USB.
* BLE.
* Can act as RFID tag (untested).
* DWM1000 for UWB.
* Accelerometer, gyro, compass, altimeter, thermometer.
* LiPo charger with power either from USB or a small solar panel.
* Size: 25x30 mm.


=== LPS RPi ===
http://www.loligo.se/LPS_RPi.jpg
* Plug-in board for Raspberry Pi. We see this board as a cheap way to try out DWM1000 and as a tool for analysis.
* DWM1000.
* DIP for address setting.
* Altimeter.


=== BLUEBERRY ===
https://www.instagram.com/p/BORWzUHBIoa/?taken-by=loligoelectronics
https://www.instagram.com/p/BOR_GLkh7-6/?taken-by=loligoelectronics
* First board of our new family of small berries.
* A bit like LPS^2 Mini without UWB and USB, but with more sensors. Can e.g. be used for motion analysis or as a weather station.
* nRF52 as MCU, i.e. ARM Cortex M4F.
* BLE.
* Accelerometer, gyro, compass, altimeter, thermometer, RH, light, UV + a few I/O.
* Battery holder for CR1632.
* Size: 20x20 mm.


=== CRANBERRY ===
*** Exists as HW prototypes, but does not yet fully work. Something in the strain gauge interface consumes too much power. Only listed here as an example of an upcoming board. ***
https://www.instagram.com/p/BOXEmRIhkrs/?taken-by=loligoelectronics
* Second board in our new family of small berries.
* Identical to Blueberry, except that it also handles strain gauges, has a larger battery and thus also larger size.
* Battery holder for CR2032.
* Size: 26x26 mm.


=== CLOUDBERRY ===
Does only exist in CAD, not yet as a physical prototype. Intended to connect both the Berry and LPS^2 families to the internet using either WiFi or LoRa. Might also have the option of GSM, depends on customer need.


We would like to probe your interest in these boads, and if possible, receive pre-orders for the ones soon to be sent to production (LPS^2, LPS^2 Mini, LPS RPi and Blueberry). Pricing will depend a bit on the initial production volume. We do not yet know their final price, but Blueberry and LPS RPi will be cheapest and LPS^2 and LPS^2 Mini somewhere around the price for our current LPS boards. Possibly with the exception for a fully equipped LPS^2 (WiFi, extra FLASH, etc) that will cost more. We do not want any money up-front, but really would appreciate very quick payment after shipment. That way we can afford paying the factory in time… :-) We estimate a delivery time of 4-6 week for all boards except LPS^2 that will take a little bit longer (something like 8 weeks).


If you have not yet reached your weekly youtube limit, here is a little video showing our test rig for Angle of Arrival (AoA):
https://youtu.be/D9BWkx_0Sz8
Some explanations:
* Distance between receiver boards (two modified LPS boards to handle external clock and synk + better antenna) is 300 mm.
* The x axis shows time.
* The y axis shows difference in distance to the tag.
* The blue dots are individual measurements and the green line is the mean value.
* Both TDoA and TOF can be used, i.e. both angle and distance to the tag can be measured.
* In the bottom of the screen values for TDOA, TOF (if enabled) and RSSI are shown.
* At 0:20 a slider in the web interface controls the rig orientation. Much easier to rotate the rig than running around with the tag.
* At 1:30 an additional degree axis is activated in the settings menu.
* At 2:28 TDOA+TOF is deactivated, so that only TDOA is shown in the bottom of the screen. This allows for higher update rate.
* At 3:03 txpower settings are played around with, with resulting changed RSSI seen at the lower part of the scrren. All DW1000 settings are available via the settings tab, making test and evaluation easy.
* The UI was recorded in Brisbane, Australia and the webcam in Stockholm, Sweden. Hence the delay and artifacts - sorry about that.

For us this test rig has led to valuable insights on how DW1000 operates and was important in the development of LPS^2 and its AoA abilities. It is important to note that our AoA implementation so far only works well with free line of sight. It might be possible to handle less favourable conditions by looking more closely at the registers of DW1000 to filter out reflections. For AoA uniform antenna group delay is very important, so using the same type of ceramic patch antenna as on DWM1000 is not possible.


If you happen to pass by Stockholm or Brisbane, feel free to come by and say hello!


Best Regards,
Göran Nordahl and Niklas Casaril