typical sundaymorning
US $5.65 incl. shipping
you could charge a supercapacitor that in turn powers a mini TTN node notifying water is used/running
hmmm… if you make a bigger system and mount that between the watersupply pipe in your house, you generate energy evertime you open a tap or go to the toilet maybe enough to slowly charge a little lion battery …
cleaning my bookmarks I found this retired Sparkfun product Miniature Solar Cell - CPC1822
somebody wrote that it generates a few uA … now with current node consumption getting under 1 uA that maybe interesting again, maybe in combination with a super capacitor to build a lowcost selfpowered thing.
found this alternative :
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https://www.hackster.io/bobricius/bpw34-solar-supercapacitor-powered-led-watch-1c725b
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https://hackaday.io/project/21342-bpw34-solar-powered-led-watch
Charging:
Charging is very simple because vinatech scap are 3V, just I use 3V
fixed voltage LDO MCP1700T3002ETT with 10R resistor to limit charging
current + shottky diode
for protection reverse current to LDO … charging voltage drop to
acceptable 2.95V
Discharging:
Heart is fixed 3V version of MAX1724 extremely low 1.5µA quiescent
supply current Step-Up DC-DC Converter which can work until 0.4V imput
voltage
I can use about 87% of stored energy. In all operation time I have
stable 3.001V for MCU.
I also have on board space for newest MAX17222 … 300nA Iqc bu I am
unable to solder 6-Pin μDFN
Average consumption is now about 7uA.
MCU:
I am using PICOPOWER Microchip/ATMEL ATMEGA328 standby consumption with
runing RTC is 0.9uA
if it works for a watch… why not for a node
- instead of the time we need heartbeatrate / temperature / bloodpressure and oxygen level
You could do with a few more adapters on that antenna connection
yes I know
but its the standard cable with BNC you get when buying the ‘conrad’ GP and RAK is using the ‘wrong’ connector on their adapterboard…
No reason why not;
If ‘Average consumption is now about 7uA’ you could send around 20 SF7 20 byte packets a day if you dumped the watch functions.
I made a new pcb for the Sensebender to replace the NRF24L01 for a Lora RFRM95 module:
More info Sensebender-Lora
finally found an affordable waterproof enclosure that fit’s all the components for the mobile gateway build (i’ll hope)
a few of these bad boys as power source
I will use 2 of these enclosures So that the powersource and 4g gateway electronics are separated.
Main use will be ‘field’ experiments and not a selfsustained solar gateway hence the separated
heavy ‘12v - 5v battery pack’… the two units ‘click’ together because inside are strong magnets.
DC-DC 5A Automatically Boost Buck Step Up Down
2S 20A 7.4V 8.4V Lithium Li-ion Charger Protection Board
I did’nt go for that one, but have some TPD laying around … somewere …
power consumption 3g TTN connected HUAWEI B315-22 4g router / wifi off
idea : TTN uno packet generator shield under construction
use case : hard/software testing (is my graph / gateway / dooralarm working? )
2 pos switch - join ABP / OTAA
4 pos switch 1 - single shot / 30 sec / 60 sec / 300 sec interval
4 pos switch 2 - temp (Si7021) / random temp -10 +40 / fake GPS / ACK
red button - single shot
left button - reset
middle button - join
oled 1.3 I2C 128x64 SSH1106
proto uno shield
“For lithium polymer batteries the under-voltage threshold is 3V”
Very good idea.
So I have some of these N-type chassis connectors and one of the RAK antennas so I have a question. This would make an elegant outdoor gateway, the antenna anchored to the roof by the ali base and using the N chassis connector to enter an IP67 enclosure containing my @Charles’s specification Pi-Zero W + RAK831 gateway. All I need from the inside of the house is power… Result!
My quesiton (to the rf gurus) ; in a perfect world, how do I terminate a co-ax cable (say SMA pigtail) to the back of this N chassis connector without being lossy? Can I carefully ground the shield to the shell exposing as little of the antenna conductor as possible? Any hints?
sure…
1- buy a complete assembly with quality cable (they are not expensive)
2- not all enclosures are metal … some are painted aluminium / plastic
Pycom boards landed during the week. Must teach self MicroPython… I am more the welder than the programmer type
LOLIN32 Lite, the “Crash test dummy”
#selfimprovement #notsurehow #itworks
ANYONE interested in opening The WORKBENCH part 2 ?
this one is almost full
Given the number of messages in this topic I was wondering when you would start part 2. I am already getting lost when searching for something I know to have been posted here. (And search does not always work due to people posting just pictures/youtube links without a brief description)