I use a MCP4017T digital pot. the 50K one. I tested it, it worked. the dimming range isnt that great, but i think I have between 10% and 75% . To turn it off I have a mosfet to pull the DIMcontrol to GND and a mosfet to let DIMcontrol float (full on).
since the range that I have is limited, im curious how the DAC will operate.
When I look at the schematic from @jimmyjames, I see that he uses the mcp4716a0t-e/ch as DAC.
@jimmyjames Cool, I tried a DAC, but since my inexperience, I didn't get it to work with the FL5150.
I just received the PCB's I ordered and use a 50K digi-Pot. But now I want to use the DAC.. 
Sofar:
it's been a while. A short status update. I made a PCB and I'm testing the principals, but since I lack the time it will take a couple of months more 
.
First impressions, I can control the chip with a digital potentiometer. I use a 100K for dimming, and pull it to ground for shutdown.
The 100K pot cost a couple of cents. Preferably you would use a 250K but those cost around 9 euros.
I made some new PCB's for testing, I made some booboos with the first tests. But as I said, I'll be busy the next couple of months.
Since the dimmerpin needs a resistor to ground. I placed a 1M ohm digital potentiometer and used it to controll the dimmer. so far it works (a bit).
1M ohm is to much, so maybe I can get is working with just one or two 100k ohm.
I solderen together a very rough setup, and I can dim the light using a pro-mini 3,3v.
It still has some flickering, and I think I need to get a MOSFET or something to pull it to ground to turn the light off.
But so far so good.
@nagelc just bought some things to get me started, I have a fallback, just use digital resistors, in series, if needed.
After reading the datasheet again, im not so sure the DAC will do the trick, it's the pull-down resistors that determine the voltage, so I think a DAC won't work.
@omemanti i did some digging, looks like a DAC will solve my problem. If it works I'll close this request. Fingers crossed.
Hello,
I need some help,
I'm trying to figure out how to build a remote led dimmer.
Now I saw great Scott, and he build one with an FL5150.
I thought this would be a chance to combine it with an nrf52 module that I use for my other nodes.
The question is, can I replace the potentiometer with a digital one.
I looked at a AD5241BRZ1M it has 256 steps from 0 to 1mio (it only needs 0 to 250 though, but the 200ohm seems to be too little, correct me if I'm wrong and the 250ohm are too expensive to my liking.
Or is there another way of doing this?
thnx!
@olision said in Choosing the right NRF chip for MySensors:
think the only advantages choosing a nrf52840 over the nrf52832 is the range according to the spec sheets and the possibility to connect a LiPo battery directly without using a voltage regulator. On that later, is it more energy efficient to use the LiPo battery directly than using an external LDO?
Has anyone tried those chips on a MySensor sketch or built their own sensors using those chips? Any other recommendations or one I should go with for my custom PCB?
Thanks for your help making that component choice!
hey,
I don't think the NRF52840 is working with MySensors yet.. But I don't know what happened in de last months on the development side. I believe @NeverDie was working with those chips in combination with micropython.
I personally stuck with the NRF52832, I have a couple of nodes working with Ebyte modules. It suits my needs and I stockpiled some modules for future projects.. Just browse openhardware.io and you can find a couple of examples. @berkseo made also some things you want to take a look at.
@nca78 I don't use ATAES132A. I put it in just in case I wanted to invest some more time using it.
I now just use SimpleEncryption, it's secure enough for my purpose atm.
(since the area I live in uses KAKU a lot, an insecure 433MHz lightswitch, I don't think anyone would be bothered to hack my temperature sensors. I found 163 433Mhz devices when I left domoticz logging for a couple of days.)
If someone would be interested:
Enclosure
Ard. Mega enclosure
Raspberry enclosure
Had to do some modifications for the mega, but the cost of this enclosure was more than worth it.
Hmz.. normaly don't buy stuff at conrad but apparently they have good prices on cases... 