Return items will be accepted within 40 days when is the date of receiving the goods. Customized items cannot be returned or exchanged. Items bought with an e-gift card are exchangeable only; refunds are not applicable.
Free Gift
Welcome to Roymall, your professional website for purchasing premium department store gifts. We highly value and appreciate your support, and we want to express our gratitude by adding an extra touch of excitement to your purchases. When you shop with us, you not only get to enjoy high-quality products that enhance your lifestyle, but you'll also receive an exclusive free gift with every order you place. Ready to explore our collection and find your perfect gifts? Browse our selection of premium department store items, place your order, and look forward to the excitement of your free gift arriving alongside your purchase.
Shipping Policy
We will work hard to deliver items to you after receiving your orders and make sure they arrive safely. Delivery details will be provided in your confirmation email.In most cases, orders are processed within 2 days.Under special circumstances, it will be delayed as follows: When you place an order on Saturday, Sunday or public holidays, it will be delayed for 2 days..Normally, it needs 5-7 working days (Monday to Friday) without being affected by flight delay or other environmental factors..Because our shipping service is worldwide so the delivery times will depend on your location so it may need a few times and please wait patiently if you are in remote districts or countries.
1. Return & Exchange Policy
We only accept items purchased from roymall.com. If you purchase from our local distributors or other retailers, you cannot return them on our side.Final sales items or free gifts are not acceptable for a return.To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.After receiving return instructions from us, please package up your returned items and drop your package at the local post office or another courier. We will process your return or exchange item within 3-5 working days after we receive it. The refund will be processed and credited automatically to your original method of payment.No returns or exchanges can be accepted if the product was custom produced, including custom size, custom
color, or custom printed.Need more help, please contact us. service@roymall.com or Whatsapp: +447549870296
2.Refund Policy
You'll get a full refund or 100% store credit after we receive the returned package and check it. The refund will be processed and credited automatically to your original method of payment.Please note that shipping costs and any duties or fees are not refundable. The extra shipping costs are non-refundable once the package has been shipped. You are responsible for paying these fees and we’re unable to waive or refund them, even if the order is returned back to us.Once we received and confirmed your returned item, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.If you have any problems regarding the refund process, please contact us. service@roymall.com or Whatsapp: +447549870296
2. The amplitude of the output audio signal is adjustable, the size of the sound can be detected, the gain is adjustable, and the performance is stable
3. Use single-point grounding wiring to reduce loop gain and improve audio signal quality
4. With fixing bolt holes for easy installation
5. Standard ARDUIN0 interface, which can be directly connected to the ARDUIN0 development board
6. Good sensitivity, built-in amplifier circuit, adjustable gain, voltage signal of sound intensity can be obtained through AD conversion
7. Suitable for ARDUIN0 platform, compatible with ARDUIN0 sensor interface
Interface description (3-wire system)
VCC: 5V voltage
GND: External GND
OUT: analog voltage signal output, signal amplitude VCC/2
Product Usage:
The sound of the surrounding environment can be converted into electrical signals to detect the sound of the surrounding environment. The output of A0 is an analog signal, and the AD operation can be performed on the A0 terminal to collect the signal for secondary development and application. Of course, it can also be directly connected to the corresponding sound device for sound playback.
Instructions:
1. Connect VCC and GND, the module power indicator is on, adjust the potentiometer of the module to the appropriate position; (This potentiometer mainly adjusts the amplitude of the AO output analog signal. Under the same decibel volume, when adjusting clockwise, the AO output amplitude is larger; When adjusted counterclockwise, the smaller the AO output amplitude, when adjusted to the end, it is equivalent to the grounding of the + end of the microphone sensor.)
2. At this time, the AO end can be connected to the ADC chip or the ADC pin of the single-chip microcomputer for ADC operation, and the amplitude change value of the sound can be obtained for more flexible secondary development; the AO end can also be directly connected to speakers or headphones Realize the playback of the amplified audio signal.
Roymall C.o.
Free Gift
Shipping Policy
Return Policy
Coupon Code
Direct purchase from the factory 
Electronic Components & Supplies
Module Board
Sensor & Detector Module
