KD8CEC v1.097 Beta will be released shortly

Ian KD8CEC has been busy again in conjuring up new features in his CEC firmware.   He is tempting us with descriptions of two new features:

  • Nextion display update that makes it easy to adjust keying speed and to select the keyer type (Iambic A, Iambic B or Straight Key) even while in TX
  • Adding an additional arduino, connected to the Raduino via i2c, to provide an S-meter function.

The first feature is well explained by the photo above. The second feature is a bit more difficult to describe.   By adding a US$3 additional arduino the µBITx now has double the number of analogue and digital ports and another 32K of program space.   This could be a fun ride!  The first function is a basic one, but an important one.   A much more sensitive S-meter.   But wait there’s more, as yet to be fully described.  If you already have a Nextion screen, it looks like you may be in line for a half decent signal analyser function.

Connecting up the arduino

The circuit is pretty straight forward, and involves just a couple of resistors and a capacitor, along with wiring to +5v and ground, and the two i2c lines.

Simulated S-Meter and SWR meter on small OLED display





Duwayne KV4QB has been playing with an Arduino Pro Mini and a small OLED display to use as a stand alone replacement for a analog meter.  The existing Raduino in the µBITx does not have sufficinet spare analog input pins to provide everything that Duwayne wanted to measure.

More information can be found on his blog at:

He is also working on a small board to provide forward and reflected power readings for SWR metering and power measurement.

This has created a bit of interest on the list, and represents an interesting idea that is potentially adaptable to other projects and use cases.