SenseBender, check wires

[mfalkvidd]

Looks to me like the NRF is without +. See discussion and instructions in http://forum.mysensors.org/topic/2891/nrf24l01-will-not-start

[Sweebee]

I checked them, but they are all the + version nrf24l01+

[tbowmo]

@Sweebee

I can't see the + in the picture, that validates it as a nrf24l01+ ?

Check page 73 in the datasheet for the markings http://www.nordicsemi.com/eng/content/download/2726/34069/file/nRF24L01P_Product_Specification_1_0.pdf

You could try disabling the + variant check in the Mysensors core
https://github.com/mysensors/Arduino/blob/master/libraries/MySensors/MyTransportNRF24.cpp#L35

And perhaps set RF24_DATARATE to 1Mbit instead of 250Kbit (as 250kbit is only available on the + variant)

[Sweebee]

I have used this nrf with other arduino's and there they work fine.

This is a close-up picture: https://i.imgur.com/CLnR6p6.jpg

[mfalkvidd]

The + is clearly visible on that picture so no need to reconfigure for the non-plus chip.

[hek]

@Sweebee

Do you have a multimeter (with continuity test) to help you check that the NRF socket pins is connected with the MCU?

[Sweebee]

@hek yes, the sockets are fine. Maybe i have to measure directly between the atmega and the socket?

[hek]

@Sweebee

Yes

[Sweebee]

@hek Every nrf pin has a connection to the atmega. But is it normal that the VCC and CSI are connected to each other?

I measured a mysensors pir and they don't have a connection to each other.

[tbowmo]

@Sweebee

There shouldn't be any short-circuit between any of the pins on the connector. Could you check the board for solder bridges?

[Sweebee]

@tbowmo Can't find any bridges. On the atmega it's hard to see, but the pins that are connected to each other aren't close to each other.

[tbowmo]

@Sweebee

The short is between two adjacent pins in the header, it could be that it's the socket that has a defect.

Next step is therefore to remove the socket. Either by desoldering it as a whole unit, or break it apart and remove 1 leg at a time. But do be careful not to damage the pcb.

[Sweebee]

@tbowmo Got it! thanks. Stupid me. There was some lost soldering in the header.