Quantity   Component name
1 × Wemos D1 mini http://s.click.aliexpress.com/e/L4ujNpCk (affiliate)
1 × TCS34725 http://s.click.aliexpress.com/e/rV9KS6TI (affiliate)
1 × Tactile button
1 × Litmus paper http://s.click.aliexpress.com/e/32h1lKQ4 (affiliate)