NextPCB gives to start with 2-layer 100 X 100 mm PCB with $ : https://www.nextpcb.com/?code=Htoeletric 4-layer PCB – 12$ : https://www.nextpcb.com/?code=Htoeletric **************************************************************************************************************************************** In this DIY IoT Job, we will make an IoT Centered Clever Health Monitoring System that can evaluate SpO2 (percentage of oxygen in the blood) and heart level in BPM (Defeat Per Moment). […]