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.
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
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.
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?
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)
(they are not expensive)
