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Test a TCA9548A I2C multiplexer with Uno wiring and a channel scanner, using two same-address boards while checking masks, pull-ups and branch selection.

Bring up a DS1621 Arduino logger with explicit conversion startup, DONE checks, signed half-degree decoding and safe handling of nonvolatile busy status.

Compare Arduino Mega 2560 price in Pakistan with checked Epro listings, then assess USB variants, accessories, power and shield compatibility before buying.

Choose an OLED display module for Arduino by controller, resolution, I2C or SPI interface, voltage and memory needs, with current Epro listing prices.

Bring up a TLV9002 Arduino signal path with correct feedback, valid headroom, verified ADC reference and deliberate load and settling checks before adding gain.

Choose an ADS1015 ADC by true 12-bit format, multiplexed channels, input-rail limits, gain setting and conversion rate rather than confusing it with ADS1115.

Compare ultrasonic sensor prices in Pakistan, HC-SR04 and JSN-SR04T options, mounting accessories, voltage requirements and range limits before buying.

Assess an IRF520 Arduino module by its actual schematic, gate-source drive, reset state, small-load measurements and protection rather than its driver-board label.

Build a low-voltage NE555 astable LED blinker with a complete wiring table, nominal timing calculation and practical troubleshooting checks.

Set up an STM32 ST Link driver using STSW-LINK009, then check probe detection, supported tools, SWD wiring and target power before flashing.