The WORKBENCH part 3

[BoRRoZ]

Well, Jeff, my story continues, I just finished the 6 th (!) mail to BANGGOOD, the Chinese supplier.
They stated that POST NL can put in the track and trace, that they returned the package, BUT, that’s not enough proof for them to act (reship or payback) because in their experience with POST NL sometimes they don’t receive the ‘returned’ package !
So they wait for the package OR I must proof with documents that the package is returned, documents that POST NL refuses to give or show to me.

Well… I have written this package of and booked it as ‘stolen’ at this moment

[LoRaTracker]

Thanks, If you recall a discussion on using timestamps to ‘average’ the position of nodes it was mentioned that the error in actually applying the timestamp at the Gateway could be significant.

Those gateways are up to 29,000km apart, according to the time stamps …

[BoRRoZ]

@LoRaTracker

Those gateways are up to 29,000km apart, according to the time stamps

and in reality 5 meters

[Jeff-UK]

@BoRRoZ @LoRaTracker which way around/through the earth are you guys measuring? where is the txing node? mustnt be the same direction!..

[LoRaTracker]

Well, the furthest appart they could be on Earth is circa 20,000km.

[Jeff-UK]

Ah! Spoilsport! Please dont let facts get in the way of a good joke! And besides what about our Lacuna friends and others…

The LIBRARY basement part 10

https://news.yahoo.com/navy-confirms-existence-unidentified-flying-190739477.html

Always wondered where Nicolas S got the inspiration for LoRa from …cold war radar implementations indeed!

Also could be gw seperation is 5m one way and 40074995m the otherway with the likely error/uncertainty values for the basic timestamp (ok yes I know EM travels in straight lines…) taking circumference as ~40075km

[LoRaTracker]

@Jeff-UK

Ah! Spoilsport! Please dont let facts get in the way of a good joke! And besides what about our Lacuna friends and others

Maybe one Gateway was really in Geo-Stationary orbit ?

[Jeff-UK]

…an ambition?!
And besides would save dealing with all that LEO doplar nonsence!

[BoRRoZ]

heat shrink

[Jeff-UK]

Just spotted this Rob so now am SURE you will want to!..

Big ESP32 + SX127x topic part 3

I have LMIC which runs entirely inside the S76G-based T-Watch daughterboard (on it’s STM32L073 MCU) as a part of my SoftRF port on STM32 platform. But this topic is out of scopes for this ESP32 thread. [t-watch-extant-3]

[BoRRoZ]

lyusupov/SoftRF

oh no … to many interesting things… stop that Jeff

[bluejedi]

Wow, these 2A LiFePO4 protector boards are really small (battery is AA size):

[BoRRoZ]

ah… you found them

yep very small… but low currents too

Q : at what voltage ‘it’ switches off ?

[bluejedi]

@bluejedi

Based on your link I was able to find 2 (max 2A) boards.
They draw up to 5 uA, which is a pity for low-power applications.
(Not sure if that is a constant quiescent current or only at max load.)

Yes found them based on your link.
Lowest current (2A) version was deliberately chosen to keep quiescent current as small as possible and 2A is more than enough for low-power nodes (ESP8266 and ESP32 using WiFi included).

@BoRRoZ

Q : at what voltage ‘it’ switches off ?

At 2.0V (if provided specs are correct).

Specs say weight is 10g but is actually 0.34g.
Wondering about the reliability of the rest of the specs…

[BoRRoZ]

max continous discharging current 2 A !

[Jeff-UK]

What price are you seeing for 1/10/100off?

[bluejedi]

Shipping was relatively expensive (for product/AliExpress) but arrived quickly in 12 days. I ordered muliple otherwise the board would be more expensive than the battery.

FYI: B+ and P+ are shared/connected, B- and P- are not (not common ground).

[Jeff-UK]

Thanks, and what have you seen for the AA FePO4 batteries?

[BoRRoZ]

[bluejedi]

(Current price)