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The team continued to order parts for this phase and do more prototyping. This page is about the stance of the budget and the BOM at the end of phase 3. The team spent approximately $110 compared to last phase. The main purchases was to help build the prototype for the electronics for the torch. The main purchases were the wire kit, male DC power adapter, the ESP-32 MCU, copper tape, and power supply for the base station. Figure 1: Budget Sheet We also created the updated BOM for the system. Fig. 2 and Fig. 3 shows the BOM for the base electronics and for the torch respectively. It shows the quantity, the manufacturer, the part #, the description of the part, the cost of the part, and the total part of the item. For the electronics it uses the ESP-32 as the gateway microcontroller, the copper tape for making capacitive sensors, a 120V to 3.3V panel power supply, and a pump for the oil. Figure 2: BOM for Base Electronics Fig. 3 shows the BOM for the torch. The parts include: prototype board, main MCU for torches, copper tape for capacitive sensors, solar panels, solar lithium ion charger, lipo battery, 2.1mm adapter, 10uF capacitor, 0.1uF capacitor, and a 3.3V Voltage Regulator. Figure 3: BOM for Torch Fig. 4 and Fig. 5 shows the BOM as Fig. 2 and Fig. 3 but in quantities of 100. The price either stayed the same or did not change much unfortunately. It is noted that if we had contacted the manufacturers directly the price could be possible lower. The base cost for the electronics would be $27.84 which didn't change from Fig. 2. However, the base cost for Fig. 5 is a little less than the base cost for the torch in Fig. 3. Figure 4: BOM for Base Electronics QTY: 100 Figure 5: BOM for Torch QTY: 100Bill of Material (BOM)
