In the last few days, I was busy with Eagle, trying to design the PCB of the new Fuelino Proto3. Compared to the previous Proto2, this new prototype has the following changes:
- Fixed some problems about the position of the LEDs. Since there is not much space left on the board, I decided to remove the 2 LEDs connected to Cylinder #2 input and output commands. I substituted them with simple resistors. There are still 2 LEDs for Cylinder #1.
- I added an additional SPI connector (6-pins), therefore the SPI connectors are now 2. This allows, for example, to connect a Catalex Micro SD card module, and a Wi-Fi module, at the same time.
- Some improvements about GND and power supply areas. These areas have been enlarged, in order to reduce the resistance, and improve immunity to noise.
Before sending the Gerber data to the PCB supplier, I am still performing some double checks, to make sure that there is no wrong electrical connection (like short circuits between different polygons). By the way, I found many interesting websites (online Gerber viewers) which show the pictures of the Gerber file layers. During the design of these Fuelino boards, I also found interesting the guide on SparkFun website, which explains how to export the Gerber files starting from the schematic and board created with Eagle.
