SparkFun Forums

[guest]

hello

I have used the SPI interface for this chip as shown on the nordic website. Where the 1 data pin on the RF24G is connected via 10k resistors to the MISO and MOSI pins of my controller. However when I send data the voltage drops by half, and i think the rf24G does not pick it up.

This can easilt be solved by changing the resistor ratios, but then why would nordic show them as so in the explanation of the spi interface? What am i missing?

[sparky]

Dare I ask what you've got the RF-24G hooked to? A little more specifics would be helpful.

If you are running your micro at 5V, you may see the nRF2401 try to dissapate the over voltage through clamping diodes which is BAD. Make sure you are running everything at 3V.

Nuther explanation could be contained in what tool you are using to measure this voltage. If the SPI is clock out bits (1s and 0s), you'll see the average voltage with a cheap-to-midrange meter. Hence the half voltage.

-Nathan