Apollo2’s hidden USB

Apollo2’s hidden USB is not a hidden hardware feature, but software bit-banging using Apollo2s flexible GPIOs including the capability to drive 1.5k pullup resistors on special pins used with I2C.The following picture shows the connection between MCU and USB port: The solution supports low-speed USB for realizing HID USB transfers for example. One idea is … [Read more…]


Apollo3Blue is now available in Europe via the webshop of Fujitsu Electronics Europe GmbH: http://shop.feeu.com The best way to start with Apollo3Blue is to use the evaluation board http://www.feeu.com/shopAMA3BEVB For later on prototypes Apollo3Blue is available in BGA (AMA3B1KK-KBR) http://www.feeu.com/shopAMA3B1KK-KBR or as CSP (AMA3B1KK-KCR) http://www.feeu.com/shopAMA3B1KK-KCR Datasheets and latest software is available at the Ambiq Micro … [Read more…]

ClickBeetle Model-Train Controller

Looking back to the magic N-track train I was searching for something bigger but using the same firmware with advanced features. I decided to keep the ClickBeetle standard to add more boards offering to possibility to build a flexible HMI.      The base board called HmiBeetle is capable to add up to 5 ClickBeetle boards … [Read more…]

Maerklin 4316 Central

You are right, Maerklin 4316 is not a central but a normal waggon. But with a RaspberryPI running srcpd and Rocrail this waggon can be easily turned into a DCC central. We need a circuit creating a differential protocol from the serial stream of the RaspberryPI Zero W, so for that I had used DigiSpark Mini … [Read more…]


ClickBeetle celebrates Christmas with the ChristmasBeetle baseboard for example using BlueBeetle I. See the schematics: Schematic_ChristmasBeetle_v10 And a 3D PDF of the PCB: 3D_ChristmasBeetle See the video:   See more about ClickBeetle here

Ultra Low Power MCU – How to measure energy consumption?

Starting with ULP MCUs like Ambiq Micros Apollo1 or Apollo2 available via shop.feeu.com is very easy, but designing ULP applications can be a nightmare without good tools measuring the power consumption. For Ambiq Micro Apollo Series MCUs Fujitsu Electronics Europe GmbH realized different possibilities to measure ultra low power consumption. On the one hand FEEU … [Read more…]