Introduction In recent posts I have been looking at using my new GNSS receiver on various maps such as OpenStreetMap, OpenCPN and operating systems such as Windows & RaspberryPi (Ref.1/6). Since the icebergs and polar bears have left Toronto Harbour, I thought it would be fun to do a spring fix with GNSS and AIScatcher.… Continue reading GNSS Spring Fix
ICM20948 9DOF IMU on RaspberryPi4B
Introduction In the previous post I looked at using the ICM20948 9DOF IMU with Arduino Uno (Ref.1). In this post I examine the IMU with RaspberryPi4B using Python. In order to test the IMU, I am using a protoboard with on board voltage regulator (Ref.2). The ICM20948 contains two dies on a 3x3mm package: an… Continue reading ICM20948 9DOF IMU on RaspberryPi4B
ICM20948 9DOF IMU on Arduino Uno
Introduction In previous posts I looked at using the GY-91 as a sensor board for OpenPlotter (Ref.1). This board included an MPU9250 9DOF IMU with a BMP280 temperature/pressure sensor. The MPU9250 stopped being manufactured circa 2018 and the ICM20948 is the suggested replacement. In this post I look at using an ICM20948 proto board with… Continue reading ICM20948 9DOF IMU on Arduino Uno
NanoVNA for 433MHz/70cm BPF+LNA Testing
Introduction In the previous two posts I tested a 433MHz LNA for its frequency response or S21. I first used a PlutoSDR signal generator and then a NanoVNA (Ref.1/2). In this post I will add a BPF Band Pass Filter and examine the response of the BPF+LNA using the NanoVNA. Measurement Setup Figure 1 shows… Continue reading NanoVNA for 433MHz/70cm BPF+LNA Testing
NanoVNA for 433MHz/70cm LNA Testing
Introduction In the previous post I tested a 433MHz LNA with a PlutoSDR as a signal generator and determined it had a wideband response over 100MHz – 800MHz with a gain of approx. 23dB. In this post I will do the same measurement but this time with a NanoVNA. I am always looking for an… Continue reading NanoVNA for 433MHz/70cm LNA Testing