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Diffstat (limited to '_site/projects/my-first-pcb')
| -rw-r--r-- | _site/projects/my-first-pcb/index.html | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/_site/projects/my-first-pcb/index.html b/_site/projects/my-first-pcb/index.html index d0b7938..1c3a062 100644 --- a/_site/projects/my-first-pcb/index.html +++ b/_site/projects/my-first-pcb/index.html @@ -77,22 +77,22 @@ the door over an encrypted RF channel.</p> </tr> </table> -<p>The PCBs have two layers. A copper region serves as the ground plane. The 0.3 -mm wide 1 oz/ft<sup>2</sup> copper traces can carry up to 500 mA (the tracks -connecting the power source and the linear regulators have a width of 0.5 mm). +<p>The PCBs have two layers. A copper region serves as the ground plane. The 0.3mm +wide 1oz/ft<sup>2</sup> copper traces can carry up to 500mA (the tracks +connecting the power source and the linear regulators have a width of 0.5mm). Both subsystems were functional. I was able to control the servo reliably using the fingerprint sensor.</p> <p>The designs aren’t without flaws, however. The main shortcoming of the circuits is that they draw significant amounts of quiescent currents despite employing sleep modes. The linear regulators were a poor choice as they dissipate too -much heat. The fingerprint sensor and the servo draw 13.8 mA (3.3 V) and 4.6 mA -(5 V) respectively, as long as they are connected to the power supply.</p> +much heat. The fingerprint sensor and the servo draw 13.8mA (3.3V) and 4.6mA +(5V) respectively, as long as they are connected to the power supply.</p> -<p>Although the circuit didn’t draw more than 200 mA without a load, the servo -under load could draw up to 600 mA. I’m sailing too close to the wind with 0.3 -mm copper traces. Instead, 0.4 mm wide 2 oz/ft<sup>2</sup> traces would have -been safer.</p> +<p>Although the circuit didn’t draw more than 200mA without a load, the servo +under load could draw up to 600mA. I’m sailing too close to the wind with 0.3mm +copper traces. Instead, 0.4mm wide 2oz/ft<sup>2</sup> traces would have been +safer.</p> <p>I’m working on improving the design to reduce idle current consumption and extend the battery life. Despite its deficiencies, this was my first PCB |