RF12 Archive

  • I got my boards back from Laen @ dorkbotpdx. He offers an amazing service. Not only is he very helpful, but the price and turnaround is amazing. Check him out....

    Ruby v1.0a

    I got my boards back from Laen @ dorkbotpdx. He offers an amazing service. Not only is he very helpful, but the price and turnaround is amazing. Check him out....

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  • I’ve been building some cabinets in the garage the last few days. I noticed that I was missing some data and dropping packets from the RF12 radios. Here is a...

    RF Interference

    I’ve been building some cabinets in the garage the last few days. I noticed that I was missing some data and dropping packets from the RF12 radios. Here is a...

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  • The Si4221 has a digital received signal strength indicator (RSSI). You can set a threshold in the configuration and the pin will go low when that threshold has been broken....

    Reading the ARSSI pin on the Si4221/HopeRF 12B

    The Si4221 has a digital received signal strength indicator (RSSI). You can set a threshold in the configuration and the pin will go low when that threshold has been broken....

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  • Just a few notes about Silicon Labs chips and HopeRF modules. All the info is in the datasheets or online, but I like to keep use the blog to keep...

    Silicon Labs’ RF chips

    Just a few notes about Silicon Labs chips and HopeRF modules. All the info is in the datasheets or online, but I like to keep use the blog to keep...

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  • I’ve been trying to see how many packets are lost with a Jeenode I have on my roof about 50m from the receiver in side the house. There is a...

    RF12 packet loss

    I’ve been trying to see how many packets are lost with a Jeenode I have on my roof about 50m from the receiver in side the house. There is a...

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  • The antenna length for the 3 different frequencies can be calculated like this: Length(cm) = 7500/freq(Hz) Antenna size and frequency are inversely proportional. 433 1/4 wave = ~17.3cm 868 1/4...

    RF12B Antenna length/type

    The antenna length for the 3 different frequencies can be calculated like this: Length(cm) = 7500/freq(Hz) Antenna size and frequency are inversely proportional. 433 1/4 wave = ~17.3cm 868 1/4...

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  • So I’m toying with the idea to build my own Arduino clone with the RF12B transceiver. HopeRF sells the module in at least two physical formats (DIP and SMD) as...

    RF12B Modules…time to switch frequency?

    So I’m toying with the idea to build my own Arduino clone with the RF12B transceiver. HopeRF sells the module in at least two physical formats (DIP and SMD) as...

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  • I’m setting up a wsn and each sensor node will have a different packet. I’m using a bitwise field to define the packets. For example: typedef struct{ int temp1; int...

    Getting the NodeID in a RF12 packet

    I’m setting up a wsn and each sensor node will have a different packet. I’m using a bitwise field to define the packets. For example: typedef struct{ int temp1; int...

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