Thank you OldSteve, the first precise answer LiPo sounds nice, also a 7.4 Voltage is fine. Well, i send sensorvalues via 433 MHz on this arduino, who shall controll 2 Servo-Motors. So with 4800mAh, it could be 4-5 hours? Sounds nice.So i had a look on this battery: http://www.kotte-zeller.de/LRP-LiPo-Akku-7-4V-3800mAh-30C-Hyper-Pack-Multi-Plug-Hardcase-430215.htm?websale8=kotte-zeller-shop&pi=902017Well, it has a nice capacity but its way too large and weights to much i think... Never thought, that battery-management is so hard.My 5V regulator is a linear one. "LM1084" (http://docs-europe.electrocomponents.com/webdocs/0780/0900766b807800b5.pdf)EDIT:I found this one:http://www.kotte-zeller.de/Dynamite-Reaction-LiPo-Akku-7-4V-4000mAh-50C-Sub-Hardcase-EC3-DYNB3800EC.htm?websale8=kotte-zeller-shop&pi=901974its smaller than the other one, has more capacity
you could use that LDO to get the 5v, and put the 5v output of that into the 5v pin - but if you do that, you must not connect it to USB while it's powered that way, lest you risk damage to the board
Nice okay. So i will connect the Li-Po to the servos via LDO. Parallel to that, i connect it to the arduino (Vin). Also parallel to that, i want to power my 433 MHz module (Voltage increases range, 5V isn't very good). Maybe I can increase the voltage with this LDO:http://www.exp-tech.de/pololu-12v-step-up-spannungsregler-u3v12f12?gclid=Cj0KEQiAycCyBRDss-D2yIWd_tgBEiQAL-9RkiuCb2OUDoP0vOXj4krR8xHNrMQWXvKkk9hAbmFbRksaAhMl8P8HAQto 12 V? So i get more range?
Mhm, yea i power the transmitter with 9V but its still not enough range. Maybe 20 Meters, without any walls - thats really poor.
Also I use 17,3 cm long spiral-antennas (wire) at transmitter and receiver.
Is it necessary to power the receiver with more than 5V to get a better range?I also use this "cheap" 433MHz RF transmitters; i think the same like you. What did you do to extend the range?
Does 12V on RX-side increase the range?
Okay, i tried now a spiral antenna and a normal one. the spiral one had a range of ~10 metres. The normal one had ~20 metres (eye contact). So i will use the straight version
The length of the wire used for a "helical" (what you call "spiral") antenna is not the same (not even close) as a quarter wave "whip".
@OldSteve:according to you suggestion to use another transceiver, i googled it:https://allodox.wordpress.com/2013/05/01/configuring-an-apc220-rf-transceiver-with-arduino/Looks like I need to implement another library, and that is the point. I have a intensive time-probleme, so I think i will try the Dipol-antenna! But thank you anyway!
Sounds easy. I try a dipol antenna and reduce the transmission speed. Then i Will see if I need the suggested antennas. But normally i dont have the time to order those and creat a new hardware design... costs are not a problem..