I thougt uploading via ISP-programmer deletes the bootloader?

but you can run on a lower Vmin value....
The other thread doesnt help - there was no solution for the serial-problem at 1mhz...
Greetings

Hi,

this is **very **interesenting for me. could you write a small tutorial when you solved it? i failed until today to use arduino ide with 328p@4mhz(or lower) with arduino bootloader. i read something about compiling a new bootloader - but this is too much for me to go and i didnt find a compiled bootloader for 1 or 4mhz to download :(

greetings

andreas

Hi,

why dont you design your own pcbs? Its quite easy...
Greetings

Andreas

Maybe its better to open a new thread for this question? ;)

read the description:

"but it's always best to avoid long-term (over 1 hour at a time) submersion, if you need something that can be submerged for over an hour you may want to find a different sensor. "

check the voice-recognition in Openhab for example. it is cheaper and a better solution then realizing this in hardware...

ok, great :) Lets how they look ready....

Eagle is much easier than it looks. I started a few ago with my first pcb. After looking one or two tutorials, i got my first successful schema. Just give it a try. One evening and a beer or glass of wine is enough to learn eagle.

Update: PCBs are shipped via express... :dancers:

Vcc ripple?
Cap in parallel to the ldr?

Hi,

or use a small bulb instead neon...should also work. But a cap in parallel is always a good idea for this.

I am not sure if i understand you. But if you want to upload the mqtt-gateway sketch, this is the ip, the mqtt-gateway will use. Same for MAC.

But, try the mqtt-client-gateway instead. works perfect and you can connect to a full featured mqtt-host in your network (like mosquitto).
greetings

Andreas

also check HTU21D....

i think it would be better to open a new thread for this, instead to discuss two topics in one thread....the 2xaa battery sensor is very interesting ;)

if you have a mailbox with 2 hatches, install 2 magnet switches.

one sets the "mail is waiting"-signal (postman put mail in box) and if you open the mailbox to take out the mail, the second sensor resets the state. Really comfortable ;)

very NICE :sunglasses:

@robosensor: What about power consumption, max/min voltage and measuring time?

Greetings

Andreas

Hi,

something like this: http://www.ebay.com/itm/Signalleuchten-mit-Lampe-Max-230-V-Rot-transparent-RAFI-Inhalt-1-St-/400562275133?hash=item5d435f433d

On the arduino-side, just use an LDR (http://www.ebay.com/itm/20PCS-Photoresistor-LDR-CDS-5mm-Light-Dependent-Resistor-Sensor-GL5516-Arduino-/311050784623?hash=item486c124f6f)

The LDR triggers an interrupt and the arduino wakes up to send "on" or "off" signal ;)

Greetings

Andreas

Also take a look at HTU21D....